Gossen MetraWatt METRAHit 28C light Operating Instructions Manual

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Operating Instructions

METRA HIT28c light

Calibrator

3-349-317-15

6/2.05

3 4

No measuring input !

Do not apply interference voltage except current sink

1Display (LCD)

2 ON| OFF key

! Cursor position to the right Operating mode menu: ↵ (ENTER) Changeover to sub-menus /

3 " Increase values

Operating mode menu: Selection of individual menu items

4 # Decrease values

Operating mode menu: Selection of individual menu items

5 ESC key for selecting ranges or functions

$ Cursor position to the left Operating mode menu: Exit menu level and return to a higher level,

6 Rotary switch for simulation functions

7 Connector jack for NA5/600 power pack

8 Connector jacks for calibrator output

9 DKD calibration mark, see page 4

acknowledgement of entries

against direction of flow

in direction of flow

exit parameters configuration without saving data

4 57

12 11 11 10 9

Symbols used in the Digital Display

1 Main display with decimal point and polarity display

2 Auxiliary display with decimal point and polarity display

3 : Simulator in continuous operation

4 NUM: Numeric entry of output signal

5 INT: Interval sequence active

6 RAMP:Ramp function active

7 ON: Calibrator output is active

8 Unit of measure (if blinking, refer to chapter 13 on page 24)

9 SOURCE: Current source is active

10 SINK: Current sink is active

11 Ni/Pt1000: Selected temperature sensor

12 TC: Thermocouple

13 : Low battery voltage (< 3.5 V), replace batteries

2 GOSSEN METRAWATT GMBH

Table of Contents

Page

1 Safety Features and Precautions ...............................3

2 Initial Start-Up ............................................................5

3 Voltage Simulator .......................................................6

4 Pulse and Frequency Generator (positive square-wave

pulse) .........................................................................6

5 Resistance Simulation [Ω] .........................................7

6 Temperature Simulation [°C] .....................................8

6.1 Temperature Simulation of Resistance Temperature

Detectors – Position °C

6.2 Temperature Simulation of Thermocouples – Position °C

. .................................................... 8

RTD

. ..... 8

7 Current Source and Current Sink .............................10

7.1 Current Sink – Simulation of a 2-Wire Transmitter ................. 10

7.2 Current Source .................................................................... 10

8 Interval Functions, Ramp Functions and Procedures 11

8.1 Interval Sequences – INT Function ......................................... 11

8.2 Read-Out a Periodic Ramp – RAMP Function .......................... 14

9 Using the Menus – from the Initial InFO Menu to

Operating Parameters ..............................................16

9.1 Activating the Default Values .................................................18

9.2 Transmission Mode Operation with RS 232 Interface ..............18

10 Accessories ..............................................................19

11 Characteristic Values ...............................................20

12 Maintenance ............................................................23

12.1 Battery ................................................................................. 23

12.2 Power Pack .......................................................................... 23

12.3 Fuses ................................................................................... 24

12.4 Housing ................................................................................ 24

13 Calibrator Messages ................................................24

1 Safety Features and Precautions

You have selected an instrument which provides you with a high level of safety.

This instrument fulfills the requirements of the applicable European and national EC guidelines. We confirm this with the CE marking. The relevant declaration of conformity can be obtained from GOSSEN METRAWATT GMBH.

The instrument is manufactured and tested in accordance with safety regulations IEC 61010–1:2001/DIN EN 61010– 1:2001/ VDE 0411–1:2002. When used for its intended purpose, safety of the operator, as well as that of the instrument, is assured. However, their safety is not guaranteed, if the instrument is used improperly or handled carelessly.

In order to maintain flawless technical safety conditions, and to assure safe use, it is imperative that you read the operating instructions thoroughly and carefully before placing your instrument into service, and that you follow all instructions contained therein.

14 Repair and Replacement Parts Service

DKD Calibration Lab

and Rental Instrument Service .................................25

15 Warranty ...................................................................25

16 Product Support .......................................................25

GOSSEN METRAWATT GMBH 3

Observe the following safety precautions:

• The instrument may only be operated by persons who are capable of recognizing contact hazards and taking the appropriate safety precautions. Contact hazards exist anywhere, where voltages of greater than 33 V RMS may occur.

Attention!

The calibrator has been designed for safe connection to signal circuits.

Maximum allowable voltage between connector jacks (7) amongst themselves and earth is 15 V. If U

or I

max

blows.

is exceeded, the integrated 250 V fuse

max

• Be prepared for the occurrence of unexpected voltages at devices under test (e.g. defective devices). For example, capacitors may be dangerously charged.

• Make certain that the measurement cables are in flawless condition, e.g. no damage to insulation, no interruptions in cables or plugs etc.

• No functions may be performed with this instrument in electrical circuits with corona discharge (high-voltage).

•

For this reason,

never confuse a

calibrator with a

multimeter.

• When necessary, use a multimeter to make sure that no dangerous contact voltages are present in the signal circuits to which the instrument is to be connected.

• In order to prevent damage to the instrument, observe the maximum allowable voltage and current values indicated at the jacks. With the exception of the resistance simulation and mA SINK operating modes, the connected signal circuits should not feed any voltage or current back to the calibrator. In order to avoid damage to the instrument when interference voltages are applied (within allowable limit values), the mA SINK and mA SOURCE measuring circuit is equipped with a fuse F3, which makes this measuring circuit highly resistive if excessive current should occur in the event of a fault for the duration of overloading.

Meanings of symbols on the instrument

Warning concerning a source of danger (Attention: observe documentation!)

Earth

Continuous, doubled or reinforced insulation

Indicates EC conformity

DKD calibration mark (red seal):

B0730 DKD-K19701 01-08

Consecutive number

German Calibration Service - Calibration Laboratory Registration number Date of calibration (year–month)

Repair, Parts Replacement and Balancing

When the instrument is opened, voltage conducting parts may be exposed. The instrument must be disconnected from the circuit before the performance of repairs, the replacement of parts or balancing. If balancing, maintenance or repair of a live open instrument is required, this may only be carried out by trained personnel who are familiar with the dangers involved.

Defects and Extraordinary Strains

If it may be assumed that the instrument can no longer be operated safely, it must be removed from service and secured against unintentional use. Safe operation can no longer be relied upon,

• If the instrument or the test probes are damaged

• If the instrument no longer functions

• After long periods of storage under unfavorable conditions.

Warning!

The instrument may not be operated in explosive atmospheres, or connected to intrinsically safe electrical circuits.

4 GOSSEN METRAWATT GMBH

2 Initial Start-Up

Battery operation

Be certain to refer to chapter 12.1 regarding correct battery installation.

Switching the Instrument Off Manually

➭ Press and hold the ON|OFF key until OFF appears at the

display.

Shutdown is acknowledged with two brief acoustic signals.

Attention!

As a result of internal battery voltage monitoring, the instrument may respond as follows if the battery charge level is low: – Cannot be switched on – Shuts back down immediately – Shuts back down in the event of loading at the

output. If this is the case, replace the batteries in accordance with chapter 12.1, or continue work with the power pack if possible.

Operation with mains adapter

(accessory equipment, not included as a standard feature)

During power supply via mains adapter NA5/600, the inserted batteries are cut off electronically so that they rmay remain in the instrument, see also chapter 12.2. If rechargeable batteries are used, they must be charched outside the instrument.

Switching the Instrument On Manually

➭ Press the ON| OFF key.

Power-up is acknowledged with a brief acoustic signal. As long as the key is held depressed, all of the segments at the liquid crystal display (LCD) are illuminated. The LCD is shown in the diagram on page 3. The instrument is ready for calibration as soon as the key is released.

Switching the Instrument On with a PC

After transmission of a data frame from the PC, the simulator is switched on. See also chapter 9.2.

Automatic Shutdown of the Calibrator

The simulator deactivates the output quantity after 5 minutes of inactivity. 5 minutes later, the instrument is switched off. Shutdown is acknowledged with a brief acoustic signal.

The continuous operation mode is not affected by automatic shutdown.

Disabling Automatic Shutdown

The instrument can be set to continuous operation. ➭ Press and hold the ESC|FUNC key and then switch the in-

strument on by pressing the ON|OFF key. Continuous operation is indicated at the display with the symbol.

Note!

☞

Electrical discharge and high frequency interference may cause incorrect displays to appear, and may disable the simulator. In such cases, switch the instrument off and back on again in order to reset. If the problem persists, briefly dislodge the battery from the connector contacts.

Setting Time and Date

See chapter 9 on page 16.

GOSSEN METRAWATT GMBH 5

3 Voltage Simulator

The instrument includes the following simulator functions: Direct voltage V DC, frequency f, resistance Ω, temperature °C (for resistance thermometers or thermocouples) and current mA DC.

$ !

Voltage Simulator Value

1.3520

0.,3-15

NUM ON

4 Pulse and Frequency Generator (positive square-wave

pulse)

$ !

Frequency

0100.0

05.000

(... 3x) (... 4x)

NUM ON

↵

ESC

↵

NUM ON

Voltage Range

Voltages can be simulated within the following ranges: 0 … ±300 mV, 0 … 3 V, 0 … 10 V and 0 … 15 V. The resistance of the interconnected circuit should not be any less than 1 kΩ.

➭ Connect the DUT with the measurement cables as

shown.

–

➭ Select the V calibration function with the rotary switch. ➭ Setting the voltage simulation value:

Press $! keys to select the decade, i.e. the position of the digit you wish to change, and press #" keys to set the respective digit.

➭ Changing the voltage simulation value:

Press the ESC key until you proceed to the voltage range sub-menu. Press #" keys to set the respective digit. Press ↵ key to return to the main menu.

0 .3- 15

sele t range

CALIBRATOR

Output

DUT e. g.

Measuring transducer

ESC

–

(... 2x)

Input

$ !

Voltage Amplitude

05.000

0100.0

Voltage Range

Voltage and frequency can be generated independent of one another with the frequency generator. The output signal is a square wave. The resistance of the interconnected circuit should not be any less than 1 kΩ.

➭ Select the /Hz calibration function with the rotary

switch.

➭ Setting voltage amplitude (0 … 15 V):

Press the ESC key until you proceed to the menu for setting voltage amplitude. The decade (i.e. the position of the digit to be changed) is selected with the $! keys, and the respective digit is set with the #" keys.

➭ Changing the voltage simulation range:

Press the ESC key until you proceed to the voltage range sub-menu. Press #" keys to set the respective digit. Press ↵ key to return to the main menu.

➭ Setting the frequency value (1 … 1000 Hz):

Press ↵ key until you proceed to the frequency main menu. Press $! keys to select the decade, i.e. the po- sition of the digit you wish to change, and press #" keys to set the respective digit.

0 .3- 15

sele t range

NUM ON

↵

NUM ON

ESC

(... 3x)

6 GOSSEN METRAWATT GMBH

Frequency settings of 29 Hz and greater can only be selected in a limited fashion.

Note!

☞

The following error messages may appear: “HiCurr” (high current – current at overload limit) where I (out of limits – limit value violation) where I > 30 mA. The simulator is switched off.

Attention!

In this operating mode interference voltages must not be applied to the calibrator jacks. In the event of operating errors, such as the shortterm application of a high interference voltage, the instrument/calibrator is protected by a replaceable fuse F3, see chapter 12.3.

= 18 mA, “0ut 0l” and 3 acoustic signals

max.

5 Resistance Simulation [Ω]

Resistance can be simulated by means of 2-wire connection within the following range: 5 … 2000 Ω.

Note!

☞

The following error messages may appear: “HiCurr” (high current – current too high) where I > 4.5 mA and “LoCurr” (low current – current too low or polarity reversal) where I < 40 µA (i.e. open jack sockets).

Attention!

After applying the measuring current it takes a maximum of 30 ms for the calibrator output to adjust to the specified resistance value. Incorrect measured values may result in conjunction with DUTs which do not have a steady measuring current (e.g. scanned measuring inputs) if measurement has already been started during setting time. The calibrator cannot be used for such objects.

$ !

Resistance

➭ Connect the DUT with the measurement cables as

shown.

2-Wire Resistance Simulator

DUT

➭ Select the Ω calibration function with the rotary switch. ➭ Setting the simulation value:

The decade (i.e. the position of the digit to be changed) is selected with the $! keys, and the respective digit is set with the #" keys.

GOSSEN METRAWATT GMBH 7

1454.5

–

NUM ON

Ω

CALIBRATOR

Output

–

Input

Measuring current 50 µA ... 5 mA

6 Temperature Simulation [°C]

Resistance temperature detectors (RTD) and Thermocouples (TC) with specified external reference junction temperature can be simulated.

➭ Select the °C calibration function with the rotary switch. ➭ Connect the DUT with the measurement cables as

shown.

➭ unit of measure °C or °F can be selected with the ESC

key.

6.1 Temperature Simulation of Resistance Temperature

Detectors – Position °C

Resistance temperature detectors are simulated by means of resistance values.

➭ Selecting sensor type:

Press the ESC key until you proceed to the sensor selection sub-menu. Select either type Pt100, Pt1000, Ni100 or Ni1000 with the #" keys for the simulation of an RTD. Press the ↵ key to return to the temperature simulation value main menu.

➭ Setting the temperature simulation value:

The decade (i.e. the position of the digit to be changed) is selected with the $! keys, and the respective digit is set with the #" keys. Alternatively, you can press the #" keys at any entry position until the higher ranking digits are changed as well.

Pt100/1000 Ni100/1000

sensor

RTD

°C

ESC

Sensor Selection

$ !

Temperature Simulation Value

pt1000 sele t

↵

ESC

NUM ON

0123.2

Pt1000

°C / °F

(... 4x)

°C

6.2 Temperature Simulation of Thermocouples – Position °C

Thermocouples are simulated by means of voltage. Internal or external temperature compensation is possible.

➭ Selecting sensor type:

Press the ESC key until you proceed to the sensor selection sub-menu. Select either type B, E, J, K, L, N, R, S, T or U with the #" keys for the simulation of a thermocouple. Press the ↵ key to return to the temperature simulation value main menu.

➭ Internal or external reference temperature:

Press the ↵ key until Extern appears. Selection is made with the #" keys. intern: Press the ↵ key to return to the temperature si- mulation value main menu. The measured internal refernece temperature is indicated with an ’I’ for internal on the right-hand side at the bottom of the auxiliary display. extern: Press the ↵ key to proceed to the temperature value sub-menu.

➭ Setting the external temperature value:

The last entry position on the right-hand side blinks. Enter the digits with the #" keys. Press the ESC key to move the entry cursor one digit to the left. Alternatively, you can press the #" keys at any entry position until the higher ranking digits are changed as well. By pressing the ↵ key to acknowledge the entry cursor at the last entry position on the right-hand side, you store the new value and return to the temperature simulation value main menu. The external reference temperature is indicated with an ’E’ for external on the right-hand side at the bottom of the auxiliary display.

Function Description and Applications

10 different types of thermocouples can be selected, and can be simulated within the temperature ranges specified by IEC/DIN.

Selection can be made between an internally measured reference junction temperature, or numeric entry of an external reference junction temperature within a range of –30 to +40 °C.

Important Notes Regarding the Reference Temperature

The internal reference temperature is measured continuously with the help of an integrated temperature sensor.

The reference temperature is generally measured at the thermocouple connector jack for devices under test with a thermocouple measuring input. The two measurements may yield different results, and differences are registered as errors during thermocouple simulation. The following methods help to reduce this error: a) The device under test is connected to the jacks at the

calibrator with equalizing leads for the thermocouple to be simulated.

b) The temperature of the thermocouple connector jack at

the device under test is measured with a precision temperature measuring instrument, and the resulting value is

8 GOSSEN METRAWATT GMBH

entered to t brator and the device under test are connected with copper wire.

Otherwise, the external reference temperature is entered in all cases where temperature measurement at the device under test is accomplished by means of a thermostatic reference junction (end of the thermocouple equalizing lead).

Example ad a) Internal Reference Junction

CALIBRATOR

–

he calibrator as a reference temperature. The cali-

Attention!

Output

Equalizing Lead

Terminal Block

Selecting Sensor Type, Setting the Temperature Simulation Value and Entering the External Reference Temperature

B, E, J, K, L N, R, S, T, U

Sensor Selection

$ !

Temperature Simulation Value

sens0r

lselet

↵

ESC

NUM

l:0120.2

(... 2x)

↵

E. 030.0

ESC

°C

ESC

°C / °F

(... 4x)

°C

↵

intern extern

e=tern

ref

intern

temp

Device to be calibrated

Example ad b) External Reference Junction

CALIBRATOR

Output

–

Temperature measurement, e.g. via multimeter with temperature sensor

Copper Wire

Terminal Block

Device to be calibrated

GOSSEN METRAWATT GMBH 9

$ !

External Temperature Value

↵

E:000.0

ref

temp

ESC

(... 4x)

↵

°C

7 Current Source and Current Sink

➭ Connect the device under test with the measurement ca-

bles.

➭ Select the mA current sink calibration function or

mA current source with the rotary switch.

➭ Press Esc until you enter the range selection menu. ➭ Select the desired range:,

0 … 20 mA, 4 … 20 mA or 0 … 24 mA, with the #" keys.

➭ Press the ↵ key to enter the output menu. ➭ Setting the simulation value:

The decade (i.e. the position of the digit to be changed) is selected with the $ ! keys, and the respective digit is set with the #" keys. ON indicates that the current source is active.

7.1 Current Sink – Simulation of a 2-Wire Transmitter

A current sink (0 … 24 mA) or current loop load can be simulated with this function. The calibrator regulates the current, which flows via the calibrator jacks from an external power supply, independent of direct voltage applied to the jacks (4 … 27 V). The caliibrator varies the internal resistance such that the adjusted current value flows.

Range Selection Menu

Current Range

NUM

4-20

SINK

sele t range

Example of a 2-Wire Transmitter Measuring Circuit

Peripheral Device

24 V Power Pack

7.2 Current Source

Internal supply power is used for the simulation of a current source.

–

4 ... 20 mA = 0 ... 100 °C

Range Selection Menu

Current Range

–

NUM

0-20

SOURCE

CALIBRATOR

Output

–

sele t range

$ !

Current Value

↵

NUM ON

13.452

0-20

ESC

(... 2x)

SOURCE

↵

$ !

Current Value

Note!

☞

The latest adjusted simulator range is stored to memory. Voltage at the calibrator jacks may not exceed 27 V in the current sink operating mode, because thermal overload would otherwise occur and the fuse F3 would blow. LoVolt appears at the display where the voltage is too low.

10 GOSSEN METRAWATT GMBH

13.452

4-20

NUM ON

ESC

SINK

(... 2x)

Note!

☞

The internal control circuit of the current source is monitored: if voltage drops by more than 20 V at the external burden or if the current circuit is interrupted, „Hi burd“ appears at the display.

Attention!

Simulation in Percentages (current source only)

➭ Select the simulation function and the output range

(Isink/Isource = 4 … 20 mA) with the rotary switch and the # key.

➭ Press the ESC and # keys simultaneously.

➭ Select a value for 0% (lower range limit) with the

" # keys and acknowledge with the ↵ key.

➭ Select a value for 100% (upper range limit) with the

" # keys and acknowledge with the ↵ key.

➭ The output range now includes a span of 0 to 100%, and

the unit of measure mA is displayed along with a percentage value.

➭ Exit the “percentage simulation” function by pressing the

ESC key, or by turning the rotary switch.

8 Interval Functions, Ramp Functions and Procedures

Two types of setpoint sequences can be generated in order to simulate sensor conditions at the inputs of transducers, transmitters and buffer amplifiers: Interval sequences (see chapter 8.1) Ramp sequences (see chapter 8.2) With the help of METRAwin procedures with up to 99 steps can be generated at the PC in addition to the above mentioned sequences. The following parameters must be specified to this end: measuring function, measuring range, tolerance limits, absolute limit values, setpoints and expected values. Up to 10 procedures can be uploaded to the calibrator. The procedures are then selected by name and started on-site. Measured values saved to the procedures can be subsequently read out with a PC.

8.1 Interval Sequences – INT Function

Output ranges are divided into rising or declining interval steps with this function, and the number of interval steps, as well as their duration, can be specified. Above all, this function is suited for the calibration of analog indicators and recorders during single-handed operation. Input parameters for interval sequences include:

• All simulator functions except for Hz can be adjusted as output quantities.

•A lower (Start) and an upper (End) range limit can be selected for each output quantity from within the overall range.

• The number of steps can be set within a range of 1 … 99.9. The number of steps can be entered as a whole number as well, which is especially practical for analog indicators and recorders with non-standardized scale divisions.

• The interval duration per step (t1) can be selected from within a range of 1 second to 60 minutes.

• The sequences can be run manually or automatically.

• Step jumps can be selected manually (Auto = no) with the " # keys, or automatically (AUT = yes) with selectable time per step.



90-2 software as an accessory,

Examples of Interval Sequences:

Manual Interval Sequence

After configuring all parameters in accordance with the menu flowchart on page 13 for manual interval sequence read-out (Int, Auto = no), the individual steps can be triggered with the " # keys.

The relationship between the output signal and each of the key operations is depicted with the help of the following example.

Example of a Manually Controlled Interval Sequence

Source

[mA]

manual stop

""" "

➀➂➁

"###

t[s]

The time intervals are only identical during automatic operation.

Key

1 The sequence is started by pressing the ↵ key when

Int start is displayed (see Menu Flowchart on page 12).

2 The sequence is stopped by pressing the " or the #

key, and is started again in the corresponding direction when the same key is pressed once again.

3 Stop the interval sequence by simultaneously pressing

and holding the " and the # key (2 audible acoustic signals must be generated).

GOSSEN METRAWATT GMBH 11

Automatic Interval Sequence

Automatic execution of a programmed sequence range is above all advisable if feeding to a signal circuit, and scanning of the peripheral device under test are physically separated.

After configuring all parameters in accordance with the menu flowchart on page 13 for the “automatic interval sequence” (Int, Auto = yes), the sequence can be started, and stopped or continued at any desired time.

Example of an Automatic Interval Sequence

[V]

LCD:

Interval parameters: Start =2V, End = 10 V, number of interval steps = 3, t1 = 5 s, auto = Yes (yes for automatic sequence)

Key

1 The sequence is started by pressing the ↵ key when Int

2 The sequence is stopped by pressing the " or the #

3 The sequence is resumed by pressing the " key, and

4 Stop the interval sequence by simultaneously pressing

run up stop

7,3

4.6

510152025

➀➃➁

start is displayed (see Menu Flowchart on page 12).

key. Interval time elapsed thus far is saved as t

remaining sequence duration t

and holding the " and the # key (2 audible acoustic signals must be generated).

run dn hold run up run dn

stop

continue

➂

Output quantity: U (0 … 15 V range),

is equal to t1 – tx.

t[s]

Menu Flowchart: Starting and Stopping the Interval Sequence

Int

ready

↵

ESC

Int

set start

Start sequence.

05.000

0-20 run dn

1x: Stop sequence: Display: hold (hold)

2x: Continue sequence: Display: run dn (run down)

1x: Stop sequence: Display: hold (hold)

2x: Continue sequence: Display: run

↵

INT ON

SOURCE

Start must blink.

Up (run up)

Stop the interval sequence.

Int

stop

ESC during the sequence (run or hold):

ESC

12 GOSSEN METRAWATT GMBH

Return to calibration function. ESC when stopped:

Return to sequence.

Menu Flowchart: Interval Parameters Configuration

SEt must blink: Configure the ramp.

Output Quantity:

U, ISinc, ISour, R or temp

Int

ready

↵

ESC

Int

set start

↵

ESC

I sour

Int func

End: Upper Range Limit

Number of Interval Steps

Interval Duration t1 [s]

↵

ESC

20.000

Int end

↵

ESC

05.5

Int steps

↵

ESC

02:00

Int t1

↵

Range: 0-20 4-20 0-24

0-20

Int ran ge

↵

Start: Lower Range Limit

GOSSEN METRAWATT GMBH 13

10.000

Int start

ESC

↵

ESC

auto

Int no

↵

Periodic

Sequence

YES/no

8.2 Read-Out a Periodic Ramp – RAMP Function

Ramp-type signals can be used to test dynamic performance of devices under test, or entire measuring circuits. An example would be control loop performance with a setpoint specified via the analog setpoint input at the controller. The instrument can be used to replace costly hardware and software for the set-up of long-term test bays with cyclical time sequences.

Parameters for the ramps depicted below include:

• The following functions can be adjusted as output quantities: voltage U, current sink I Sink, current source I Source, resistance R or temperature temp.

•A lower (Start) and an upper (End) range limit can be selected for each output quantity. For standard signals these are always 0 … 10 V and 0/4 … 20 mA, and are otherwise values from within the entire range.

• Rise time t1 and decline time t3 are adjustable from 0 seconds … 60 minutes.

• Dwell time t2 at the upper and lower range limits is adjustable from 0 seconds … 60 minutes.

• There are 2 ramp sequences: – Once only: t1, t2, t3 – Repetitive: t1, t2, t3, t2, t1, t2, t3, …

Examples of Ramp Sequences:

Example of a Periodic Ramp Sequence

Output

End

Start

Manually Controlled Ramp Sequences

After configuring all parameters in accordance with the menu flowchart on page 15, rising or declining ramps can be triggered with the " and the # keys. The relationship between the output signal and each of the key operations is depicted with the help of the following example.

Example of a Manually Controlled Ramp Sequence

[V]

LCD:

t1 up t2 run t3 dn t3 hld t3 up t3 run t3 hld t1 dn

cont.

stop

10 V

stop cont.

t1 t2 t3

t3 t2

#"#

➀➁➂➃➄➅

Ramp parameters

: Output quantity: U (0 … 15 V range),

Start =2V, End = 10 V, t1 = 5 s, t2 = 8 s, t3 = 5 s, repeat = Yes (yes for periodic ramp)

Key

1 The sequence is started by pressing the ↵ key when ramp

start is displayed (see Menu Flowchart on page 16).

2 Stop the declining ramp within decline time t3 with the "

or the # key.

3 Start a rising ramp within remaining decline time t3 with

the " key. 4 Stop the ramp sequence with the " or the # key. 5 Start a declining ramp with the # key, remaining dwell

time t2 is deleted. 6 Stop the ramp sequence by simultaneously pressing and

holding the " and the # keys (2 audible acoustic signals

must be generated).

14 GOSSEN METRAWATT GMBH

Menu Flowchart: Ramp Parameters Configuration

SEt must blink: Configure ramp.

Output Quantity:

U, ISinc, ISour, R or temp

ramp

ready

↵

ESC

ramp

set start

↵

ESC

I sour

ramp func

End: Upper Range Limit

Rise Time t1

Dwell Time t2

↵

ESC

20.000

ramp end

↵

ESC

00:05

ramp t1

↵

ESC

02:00

ramp t2

↵

Range: 0-20 4-20 0-24

0-20

ramp range

↵

Start: Lower Range Limit

GOSSEN METRAWATT GMBH 15

10.000

ramp start

ESC

Decline Time t3

↵

ESC

00:28

ramp t3

↵

ESC

repeat

ramp yes

Periodic

Ramp:

YES/no

Menu Flowchart: Starting and Stopping the Ramp Sequence

ramp

ready

↵

ESC

ramp

set start

Start sequence.

↵

05.000

0-20 t2 ru n

Stop sequence: Display: ho (Hold)

Continue sequence: Display: up (up for rising slope)

RAMP ON

SOURCE

dn (down for declining slope) run (run fur sequence dwell time)

Start must blink.

9 Using the Menus – from the Initial InFO Menu to

Operating Parameters

Menu-driven operation via the initial InFO menu allows the user to query online help and configure device parameters.

➭ The initial InFO menu is accessed by simultaneously

pressing and holding the ESC| FUNC and ON | OFF keys with

the instrument switched on until “InFO” appears at the

display.

➭ The display can be switched from the main “info” menu

to the other main “set” menu, and back to the “info”

menu by pressing the #" keys.

➭ After accessing the desired main menu, the associated

sub-menus are opened by activating the ↵ key.

➭ The desired parameter is selected by repeatedly pressing

the #" keys.

➭ Acknowledge with the ↵ key in order to change the cor-

responding parameter or parameters.

➭ After the desired digit has been selected with the $ !

keys and the value has been adjusted with the #" keys,

the next digit is accessed with the ↵ key, or the display is

returned to the start menu or switched to the next sub-

menu.

➭ The calibration mode is started by repeatedly pressing

the ESC key until the simulator display appears.

➭ The calibrator is switched off by pressing and holding the

ON|OFF key until the display goes blank.

The following pages include an overview of the menu structure.

Stop the ramp sequence.

ramp

stop

ESC during the sequence (run or hold):

ESC

16 GOSSEN METRAWATT GMBH

Return to measuring or calibration function. ESC when stopped:

Return to sequence.

Main Menus and Sub-Menus

ESC ON

info

set

Query Information

↵

ESC

Battery Charge Level

3.1

batt

" #"

12:45:30

27 .08 .01 time

Current Time and Date

27.08.01

caldat

Calibration Date

ESC

set

tIme

addr

↵

ESC

↵

ESC

Set Time

$ !

15:50:05

set t Ime

Possible Settings (hh:mm:ss, hh=hour, mm=minute, ss=second)

Set Date

20.11.01

set date

Possible Settings (TT:MM:JJ, TT=day, MM=month, JJ=year)

Set Device Address

set addr

Possible Setting Values (see also chapter 9.2): 0 … 15

Select Position. Digit blinks

$ !

Select Position

Change Value

Acknowledge Entry

↵

Acknowledge Address

↵

Acknowledge Entry

↵

set

GOSSEN METRAWATT GMBH 17

9.1 Activating the Default Values

Previously entered changes can be undone, and the default settings can be reactivated. This may be advisable under the following circumstances:

• After the occurrence of software or hardware errors

• If you are under the impression that the calibrator does not work correctly

➭ Simultaneously press and hold the ESC, # and " keys,

and switch the instrument on with the ON |OFF key.

9.2 Transmission Mode Operation with RS 232 Interface

The calibrator is equipped with a bidirectional infrared interface for communication with a PC. The commands are optically transferred through the calibrator housing by means of infrared light to an interface adapter (accessory), which is attached to the calibrator. The adapter’s RS 232 interface allows for the establishment of a connection to the PC via an interface cable. Commands and parameters can be transmitted from the PC to the calibrator. The following functions can be executed:

• Configuration and read-out of calibration parameters

• Calibration function and calibration range selection

• Start calibration

• Programming of user-specific procedures

Configuring Interface Parameters

Addr – Address

If several instruments are connected to the PC via interface adapters, each device must be assigned its own address. Address 1 should be used for the first device address, 2 for the second etc. If only one calibrator is used, an address between 1 and 14 should be selected. Address 15 is not used for addressing, i.e. the device with address 15 always responds, regardless of the actual address.

Switching the Interface On via PC

After transmission of a data frame from the PC, the simulator is switched on.

For this reason, the plug type mains supply should be used for long operational periods. This avoids automatic deactivation by the battery monitoring circuit.

Operating Controls in REMOTE Operation

When set to REMOTE operation, the instrument reacts like in local control operation. The instrument is put back into local control operation after switching it off and on again with the ON| OFF key.

LC Display in REMOTE Operation

The commands transmitted by the PC during direct operation will be executed by the instrument directly, provided the basic function set by the message complies with the one set on the rotary switch. The LC display will acknowledge the programmed signal value and the output type after each message.

Incorrect settings of the rotary switch are signalled by a flashing display of the scheduled basic function. The new command will be executed immediately when the rotary switch has been set to the scheduled basic function.

Interface parameters are as follows: Format: 8 data bits, no parity, 1 stop bit

Baud rate: 9600 baud

Signal LED on the Interface Adapter

One green and one red signal diode on the interface adapter give you the following information and warnings:

• Green LED:

Lights up briefly when commands are transmitted from the PC to the calibrator.

• Red LED:

Lights up during the transmission of messages from the calibrator to the PC. This occurs each time the calibrator is switched on and when a message received from the PC is acknowledged. This response, as well as an acousting signal, are generated to confirm the correct physical communication between PC and calibrator.

18 GOSSEN METRAWATT GMBH

10 Accessories

Interface adapters BD232 (without memory), in combination with

calibration software METRAwin



90-2, allow for remote con-

trol of the instrument by PC.

USB-HIT Interface Adapter

Alternatively, the METRA HIT28c light can also be con- nected to the USB interface of a PC via an USB-HIT adapter. The driver to be installed allocates a virtual COM interface to the instrument. A 2x series multimeter which can be optionally embedded in a calibration system can be connected via another USB-HIT adapter with a second USB interface at the PC.

Software METRAwin



90-2

This software allows for paperless documentation and management of calibration results, the creation of calibration procedures and remote control of the calibrator. METRA HIT28c light sequence controls can be implemented online, or off-line after downloading complete calibration procedures.

The following conditions must be fulfilled in order to allow for use of METRAwin



90-2:

Hardware Requirements

– WINDOWS and IBM compatible PC with at least

a 200 MHz Pentium CPU and 64 MB main memory

– SVGA monitor with a minimum of

800 x 600 pixels – Hard disk with at least 40 MB free memory – 3½" floppy disk drive for 1.4 MB floppies – MICROSOFT compatible mouse – if you want to print your data, a WINDOWS compatible

printer.

– 1 free serial COM interface for utilizing BD232 or

– 1 USB interface for utilizing USB-HIT

Software Requirements

➭ WINDOWS 95, 98, ME, NT4.0, 2000 or XP

GOSSEN METRAWATT GMBH 19

11 Characteristic Values

max

> 30 mA

Resolution

30000

Digits

(4¾ places)

1 µA 20 V 0.05 + 20 … 20 mA

1 µAVin = 4 ... 27 V 0.05 + 2 27 V0 … 20 mA

max/Umax

With Load of Intrinsic Error

±(% of s. + Hz) I

0 … 27 V.

ext

±(% of s. + µA)

±(% of s. +

Impedance

[mA]

µA)

Ω)

Over-

load

18 mA

Simulator

Range

Calibration

Function

Direct Voltage Simulator ±(% of s. + mV) I

0…±300 mV 0.01 mV 700 Ω 0.05 + 0.02 0 … 3 V 0.1 mV 1000 Ω 0.05 + 0.2

0 … 10 V 1 mV 1000 Ω 0.05 + 2 0 … 15 V 1 mV 1000 Ω 0.05 + 2

Pulse / Frequency Generator

Keying ratio (mark-to-space ratio): 50%, amplitude: 10 mV … 15 V

Hz 1 Hz …1 kHz 0,1 …8 Hz1)1000 Ω 0,05 + 0,2 18 mA

Current Source Max. Load

4 … 20 mA

0 … 24 mA

Current Sink

4 … 20 mA

0 … 24 mA

Resistance-Type Sensor Sensor Current

Ω 5…2000 Ω 0.1 Ω 0.05...0.1..4...5 0.05 + 0.2 5 mA

Frequencies of over 29 Hz can only be selected at limited intervals.

Shut off when I

Note!

☞

Observe maximum allowable voltage for connection from external sources to the calibrator output in the event of a current sink: U In the event of operating errors, such as the shortterm application of a high interference voltage, the calibrator is protected by a replaceable fuse F3, this means that the F3 fuse may be tripped in the event of an overload > I

Simulator for Temperature Sensors (Resolution: 0.1 K)

Sensor Type Simulator

max

Resistance Thermometer per IEC 751 ±(% of s.+K) I Pt100 –200 …+ 850 – 328…+ 1562 0.1 + 0.5 Pt1000 –200 …+300 –328 …+572 0.1 + 0.2 Resistance Thermometer per DIN 43760 ±(% of s.+K) I Ni100 –60…+ 180 –76…+356 0.1 + 0.5 Ni1000 –60…+ 180 –76 …+ 356 0.1 + 0.2

RTD Sensor Current: 0.05 ... 0,1 ... 4 Thermocouples per DIN and IEC 584-1 ±(% of s.+K)

K (NiCr/Ni)

°C / °F

J (Fe/CuNi) T (Cu/CuNi) –270…+400 – 454…+ 752 B (Pt30Rh/Pt6Rh) +500...+1820 +932…+3308

E (NiCr/CuNi) R (Pt13Rh/Pt) –50…+1768 –58…+ 3214

N (CU/Cu10) S (Pt10Rh/Pt) –50…+1768 –58…+ 3214 J (Fe/CuNi) – 200…+900 – 328…+1652 U (Cu/CuNi) –200…+ 600 –328…+ 1112

* Without internal reference junction ** Relative to fixed reference temperature in °C and thermovoltage of the

thermocouple, for additional error see also table on page 21. Reference junction, internal: 2 K intrinsic error Reference junction, external: entry of –30 … 40 °C

Range

in °C

–250…+1372

–210…+1200

–270…+1000

–270…+1300

Simulator Range

in °F

... 5 mA

–418…+2501 –346…+ 2192

–454…+1832

–454…+2372

Key

s. = setting d = digit

Real-Time Clock

Accuracy ±1 minute per month Temperature Influence 50 ppm/K

Reference Conditions

Ambient Temperature + 23 °C ±2K

Relative Humidity 40 ... 60% Battery Voltage 4.5 V ±0.1 V

Intrinsic Error

0.1 + 0.5 18 mA

Overload

max

5 mA

max

5 mA

max

20 GOSSEN METRAWATT GMBH

Thermocouple Simulation Error in [°C]

Thermocouple error is specified in the technical data as thermovoltage error: ∆U. ∆T error is dependent upon characteristic thermocouple slope.

In consideration of characteristic thermocouple non-linearity, which also applies to slope (1

dT/dU derivation), mathemat-

ically calculated ∆T error is shown in the following table for all thermocouple types in the 100 °C sub-range. The values shown in the table represent maximum possible error for the respective sub-range.

All specified error values are increased by 2 K if an internal reference temperature is used.

If an external reference temperature other than 0 °C is used, the sub-range values in the table are adjusted by the amount of the reference temperature.

Example

Ref. temp. external = 50 °C Sub-range 100 … 200 °C becomes 150 … 250 °C

For display in °F: numeric values in °F are increased by a factor of 1.8.

The °F sub-ranges are calculated as follows: °F = 32 + °C x 1.8

Additional Error for Thermocouple Simulation

Thermocouple

Typ e

Sub-Range °CJ L T U K E S R B N

– 200 ...– 100

– 100 ... 0

0 ... 100

100 ... 200

200 ... 300

300 ... 400

400 ... 500

500 ... 600

600 ... 700

700 ... 800

800 ... 900

900 ... 1000

1000 ... 1100

1100 ... 1200

1200 ... 1300

1300 ... 1400

1400 ... 1500

1500 ... 1600

1600 ... 1700

1700 ... 1800

T Error in K for Thermocouple Types at Ref. Temp. 0°C

1.17 0.83 1.52 1.2 1.59 1.03 2.38

≥

-50°

≥

0.55 0.56 0.78 0.77 0.73 0.51

0.42 0.41 0.52 0.51 0.53 0.35 3.77 3.92 0.77

0.46 0.45 0.47 0.49 0.6 0.36 2.78 2.75 0.73

0.51 0.51 0.47 0.46 0.63 0.39 2.47 2.36 0.7

0.56 0.56 0.49 0.49 0.67 0.43 2.31 2.19 0.71

0.6 0.6 0.51 0.71 0.48 2.28 2.09 0.74

0.63 0.62 0.76 0.53 2.24 2.06 4.12 0.78

0.64 0.63 0.82 0.58 2.23 2.02 3.54 0.82

0.66 0.64 0.89 0.64 2.21 1.99 3.12 0.87

0.73 0.66 0.96 0.71 2.18 1.95 2.84 0.93

0.83 1.04 0.77 2.16 1.93 2.62 0.99

0.9 1.12 2.16 1.91 2.46 1.05

0.96 1.22 2.17 1.92 2.34 1.13

1.32 2.2 1.94 2.27 1.21

≤

1370

°C:

1.39

-50°

4.79

5.29

2.24 1.99 2.22

2.31 2.04 2.19

2.39 2.12 2.2

2.52 2.23 2.24

≤

1760

°C:

2.76

2.42

2.33

1.03

GOSSEN METRAWATT GMBH 21

Display

LCD panel (65 mm x 30 mm) with display of up to 3 values, the respective units of measure and various special functions.

Display / Char. Height 7-segment characters

Main display: 12 mm Auxiliary displays: 7 mm

Polarity Display “–” sign is displayed in the range

–300 mV

LCD Test All display segments available dur-

ing operation are activated after the instrument is switched on.

Power Supply

Batteries 3 ea. 1.5 V mignon cell

alkaline manganese per IEC LR6 or equivalent rechargeable batteries. If rechargeable batteries are used, they must be charged externally.

Service Life With alkaline manganese

(2200 mAh)

Calibration Function

mV, thermocouple 48 mA 40 h

15 V 85 mA 20 h Ω, RTD 95 mA 18 h

Sink, 20 mA 175 mA 10 h

Source, 20 mA 140 mA 12 h

Service Life

If voltage drops below 2.7 V, the instrument is switched off automatically.

Battery Test “ ” is displayed automatically if

battery voltage drops to below approx. 3.5 V.

Mains Power When mains power pack NA5/600

is connected, the power supply comes from the mains power pack; battery power is not consumed; there is no risk of batteries being charged.

Fuse Calibrator F3

Position of fuse see chapter 12.3

M125mA/250V, 5 mm x 20 mm

1.5 kA switching capacity at 250 V AC and ohmic load

Electrical Safety

Safety Class II per EN 61010-1:2001/

VDE 0411-1:2002 Operating Voltage max. 50 V Contamination Factor 2 Test Voltage 500 V~ per EN 61010-1:2001/

VDE 0411-1:2002

Electromagnetic Compatibility (EMC)

Interference emission EN 61 326: 2002 class B Interference immunity

EN 61326: 2002 IEC 61000-4-2: Feature A:

8 kV atmospheric discharge 4 kV contact discharge

IEC 61000-4-3: Feature B:

3V/m

Data Interface

Data Transmission optical via infrared light through the

housing

with interface adapter as accessory

Type RS 232C, serial, per DIN 19241 Bidirectional baud rate (read and write)

(MM ↔ PC)

BD232, USB-HIT: 9600 baud

Ambient Conditions

Accuracy Range 0 °C ... +40 °C Operating Temperature −10 °C ... + 50 °C Storage Temperature − 25 °C ... + 70 °C

(without batteries)

Relative Humidity 40% ... 75%,

no condensation allowed Elevation to 2000 m Deployment indoors,

outdoors: only in the specified

ambient conditions

Mechanical Design

Dimensions 84 mm x 195 mm x 35 mm Weight approx. 420 g with batteries Protection IP 50

Extract from table on the significance of IP codes

IP XY

(1st digit X)

Protection against

foreign object entry

0 not protected 0 not protected 1 ≥ 50.0 mm 2 ≥ 12.5 mm

3 ≥ 2.5 mm 4 ≥ 1.0 mm 5 dust protected 5 water jets

∅ ∅

IP XY

(2nd digit Y)

Protection against the

penetration of water

1 vertically falling drops 2 vertically falling drops

with enclosure tilted 15°

3spraying water 4 splashing water

22 GOSSEN METRAWATT GMBH

12 Maintenance

Attention!

Disconnect the instrument from the measuring circuit before opening to replace batteries or fuses!

12.1 Battery

Note!

☞

Removing the Battery During Periods of Non-Use

The integrated quartz movement draws power from the battery, even when the calibrator is switched off. It is advisable to remove the battery during long periods of non-use for this reason (e.g. vacation). This prevents excessive depletion of the battery, which may result in damage under unfavorable conditions.

The current battery charge level can be queried in the “Info” menu: ESC| FUNC + On #" inFo ↵ X.X V (bAtt).

Make sure that no battery leakage has occurred before initial start-up, and after long periods of storage. Continue to inspect the batteries for leakage at short, regular intervals.

If battery leakage has occurred, carefully and completely clean the electrolyte from the instrument with a damp cloth, and replace the batteries before using the instrument.

If the “ ” symbol appears at the display, the batteries should be replaced as soon as possible. The instrument requires three 1.5 V batteries in accordance with IEC R 6 or IEC LR 6, or equivalent rechargeable batteries.

➭ Important for reassembly: First set the housing base onto

the housing top and align accurately (see photo below). Then press the two housing halves together, first at the bottom front (a), and then at the top front (b).

(b) (a)

➭ Secure the housing base with the two screws. ➭ Please dispose of depleted batteries in accordance with

environmental protection regulations!

12.2 Power Pack

Use only the NA5/600 power pack from GOSSEN METRAWATT GMBH in combination with your instrument. This assures operator safety by means of an extremely well insulated cable, and safe electrical isolation (nominal secondary ratings: 5 V/600 mA). Installed batteries are disconnected electronically if the power pack is used, and need not be removed from the instrument.

Country Type / Article Number

Germany Z218F

Replacing the Batteries

➭ Set the instrument face down onto a flat working surface,

loosen the two screws at the back and lift off the housing base, starting at the bottom. The housing top and housing bottom are held together with the help of snap hooks at the top front.

➭ Remove the batteries from the battery compartment. ➭ Insert three 1.5 V mignon cells into the battery compart-

ment, making sure that the plus and minus poles match up with the provided polarity symbols.

GOSSEN METRAWATT GMBH 23

12.3 Fuses

Replacing the Fuses

➭ Open the instrument as described under „Replacing the

Batteries“, see chapter 12.1.

➭ Remove the blown fuse with the help of an object such

as a test probe, and replace it with a new fuse.

Attention!

Use specified fuse only! If a fuse with other tripping characteristics, other current ratings or other switching capacities is used, the operator is placed in danger, and protective diodes, resistors and other components may be damaged. The use of repaired fuses or short-circuiting the battery holder is prohibited.

Location of fuses

Indication of fuse characteristics

(see also Technical Characteristics, page 22

13 Calibrator Messages

The following messages appear at the main or the auxiliary displays as required. See “Symbols used in the Digital Display” on page 2 for messages displayed via fixed display segments.

Message Function Significance

hiCurr

loCurr

0ut0l

lovolt

hiBurd

Simulate voltage/ Impulse

Simulate resistance/RTD

Resistance simulator

Voltage simulator Pulse and frequency generator

Current sink U < 3 V

Current source High burd = high burden, the voltage applied

Blinking Unit of Measure

All calibration functions are balanced/adjusted in accordance with technical specifications at the factory for each series METRA HIT28c light calibrator. If a unit of measure blinks, this indicates that the balancing constant which has been established and saved to the calibrator is no longer available for the respective function. If this is the case, results may deviate from the specification. We recommend sending the instrument to our Repair and Replacement Parts department for rebalancing (see chapter 14).

High current = current too high (I > 18 mA)

High current = current too high (I > 4.5 mA)

Low current = current too low (I < 40 µA) Indicates that connector jacks are open (e.g. with Pt and Ni sensors) or polarity reversal

Out of limit = limit value violated (I > 30 mA), 3 acoustic signals are generated at the same time and the simulator jacks are deactivated. After eliminaing the cause of the overload, the output can be reactivated with the ON| OFF key.

(insufficient loop impedance)

by the connected circuit is too high. The resulting voltage at the calibrator exceeds or is equal to 20 V

12.4 Housing

No special maintenance is required for the housing. Keep outside surfaces clean. Use a slightly dampened cloth for cleaning. Avoid the use of cleansers, abrasives and solvents.

24 GOSSEN METRAWATT GMBH

14 Repair and Replacement Parts Service

DKD Calibration Lab * and Rental Instrument Service

When you need service, please contact:

GOSSEN METRAWATT GMBH

Service Center

Thomas-Mann-Strasse 20 90471 Nürnberg • Germany Phone +49-(0)-911-8602-0 Fax +49-(0)-911-8602-253 E-Mail service@gossenmetrawatt.com

This address is only valid in Germany. Please contact our representatives or subsidiaries for service in other countries.

* Calibration Laboratory

Competent Partner

GOSSEN METRAWATT GMBH is certified in accordance with DIN EN ISO 9001:2000. Our DKD calibration laboratory is accredited by the Physikalisch Technische Bundesanstalt (German Federal Institute

of Physics and Metrology) and the Deutscher Kalibrierdienst (German Calibration Service) in accordance with DIN EN ISO/

IEC 17025 by under registration number DKD–K–19701. We offer a complete range of expertise in the field of metrology: from test reports and proprietary calibration certificates right on up to DKD calibration certificates. Our spectrum of offerings is rounded out with free test equip- ment management. An on-site DKD calibration station is an integral part of our service department. If errors are discovered during calibration, our specialized personnel are capable of completing repairs using original replacement parts. As a full service calibration laboratory, we can calibrate instruments from other manufacturers as well.

for Electrical Quantities DKD– K – 19701 accredited per DIN EN ISO/IEC 17025

Accredited measured quantities: direct voltage, direct current values, DC resistance, alternating voltage, alternating current values, AC active power, AC apparent power, DC power, capacitance and frequency

15 Warranty

The warranty period for all measuring and calibration instruments of the METRA HIT series is 3 years from delivery.

A warranty period of 12 months is granted for calibration. Warranty covers defective material and workmanship, not including any damage caused by inappropriate use or operating errors as well as any follow-up costs.

16 Product Support

When you need support, please contact:

GOSSEN METRAWATT GMBH

Product Support Hotline

Phone +49-(0)-911-8602-112 Fax +49-(0)-911-8602-709 E-Mail support@gossenmetrawatt.com

DKD Calibration Certificate Reprints

If you order a DKD calibration certificate reprint for your instrument, please provide us with the reference numbers indicated in the upper and lower most fields of the calibration seal. We do not need the instrument’s serial number.

GOSSEN METRAWATT GMBH 25

Edited in Germany • Subject to change without notice • A pdf version is available on the Internet

GOSSEN METRAWATT GMBH Thomas-Mann-Str. 16-20 90471 Nürnberg •

Germany

Phone +49-(0)-911-8602-0 Fax +49-(0)-911-8602-669 E-Mail info@gossenmetrawatt.com www.gossenmetrawatt.com

Gossen MetraWatt METRAHit 28C light Operating Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Safety Features and Precautions

2 Initial Start-Up

3 Voltage Simulator

6 Temperature Simulation [°C]

7 Current Source and Current Sink

7.2 Current Source

8 Interval Functions, Ramp Functions and Procedures

9.1 Activating the Default Values

9.2 Transmission Mode Operation with RS 232 Interface

10 Accessories

11 Characteristic Values

12 Maintenance

12.1 Battery

12.2 Power Pack

12.3 Fuses

13 Calibrator Messages

12.4 Housing

15 Warranty

16 Product Support