GE Druck DPI 841, Druck DPI 842 User Manual

GE Infrastructure

Sensing

Druck DPI 841/842

Frequency calibrator and
Frequency loop calibrator

User manual - K395

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B1

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A2

DPI 842

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K395 Issue 1

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Table of Contents

Introduction ......................................................................... 1

Safety ..................................................................................... 1

Safety - Marks and symbols on the instrument ............... 2

To start .................................................................................. 2

To start - Location of items ........................................................ 2

To start - Items on the display .................................................. 2

To start - Prepare the instrument ........................................... 2

To start - Power on or off ............................................................ 3

To start - Set up the basic operation ..................................... 3

To start - Select a task (Measure and/or supply) ............. 3

To start - Set up the settings ..................................................... 4

To start - Edit functions ................................................................ 4

Operation .............................................................................. 6

Operation - Frequency connections ...................................... 6

Operation - Communications port connections .............. 6

Operation - Measure Hz or count pulses ............................. 6

Operation - Change the output values ................................. 6

Operation - Supply Hz or pulses .............................................. 7

Operation - Transmitter calibration ....................................... 7

Operation - mA measurements ............................................... 8

Operation - Switch test ................................................................ 8

Operation - UPM Pressure measurements ......................... 9

Operation - Error indications ..................................................... 9

Maintenance ..................................................................... 10

Maintenance – Clean the unit ................................................ 10

Maintenance – Replace the batteries ................................ 10

Calibration ......................................................................... 10

Calibration - Before you start ................................................. 10

Calibration - Procedures (Hz - input/output) ................... 10

Calibration - Procedures (mA input) .................................... 11

Calibration - Procedures (Amplitude output) .................. 11

Calibration - Procedures (IDOS UMM) ................................. 12

Specification data ............................................................ 12

Specification - General .............................................................. 12

Specification - Frequency ........................................................ 12

Specification - Electrical connectors (A2) ......................... 12

Customer service ............................................... Back cover

© 2005 General Electric Company. All rights reserved.

Trademarks

All product names are trademarks of their respective companies.

Introduction

The DPI 841 Frequency Calibrator and DPI 842 Frequency
Loop Calibrator are part of the Druck DPI 800 series of
hand held instruments.
The DPI 800 series uses Intelligent Digital Output Sensor
(IDOS) technology to give instant plug and play
functionality with a range of Universal Measurement
Modules (UMM). Example: the Universal Pressure Module
(UPM).
The DPI 841/842 include these functions:

Function DPI 841 DPI 842

Measure/supply a frequency
or a pulse count.

Step/Ramp functions Automatic/Manual
Communications port IDOS or RS232
Language selection Yes
Measure pressure/Leak test ** External IDOS UPM
** Snapshot Up to 1000 displays with a date/time

Measure mA No 0 - 55 mA
HART® resistor No Yes
V dc output No 24 V
Switch test No Yes
Other functions Hold, Maximum/Minimum/Average,

Filter, Tare, Scaled values, Backlight,
Alarm

* Refer to “Specification data”.
** Optional item

* Yes

stamp

Safety

Before you use the instrument, make sure that you read
and understand all the related data. This includes: all local
safety procedures, the instructions for the UMM (if
applicable), and this publication.

WARNING

• It is dangerous to ignore the specified limits for the
instrument or to use the instrument when it is not in
its normal condition. Use the applicable protection
and obey all safety precautions.

• Do not use the instrument in loca tions with explosive
gas, vapor or dust. There is a risk of an explosion.

Continued

[EN] English - 1K395 Issue 1

Safety (Continued)

• To prevent electrical shocks or damage to the
instrument, do not connect more than 30V between
the terminals, or between the terminals and the
ground (earth).

• UPM only. To prevent a dangerous release of
pressure, isolate and bleed the system before you
disconnect a pressure connection.

Before you start an operation or procedure in this
publication, make sure that you have the necessary skills
(if necessary, with qualifications from an approved
training establishment). Follow good engineering practice
at all times.

Safety - Marks and symbols on the instrument

Complies with European
Union directives

Read the manual Battery

Ground (Earth)

Warning - refer to the
manual

ON/OFF

To start

To start - Location of items …

Item Description

1. ❍ On or off button.

2.

3.

4.

5.

6.

7.

8. Display. Refer to A3

9.

10.

11. Connection point for some of the optional

12. Battery compartment. Refer to B1.

13., 14., 15. DPI 842 only. Terminals to measure current, to supply

Left-hand soft-key. Selects the function above it on

■ ■

the display (Item 25). Example: Edit
Moves back one menu level.

ESC

Leaves a menu option.
Cancels the changes to a value.

Increases or decreases a value.

▲
▼

Highlights a differen t item.
Holds the data on the display. To continue, press the

HOLD

HOLD button ag ain.
Shows the Select Task menu.

MENU

Selects or accepts an item or value.

OK

Selects [✓] or cancels [ ] a selection.
Right-hand soft-key. Selects the function above it on

■ ■

the display (Item 25). Example: Settings

Communications port. Use to connect a Universal

SENSOR

/ PC

Measurement Module (UMM) or a RS232 cable.
Terminals to measure (IN) or supply (O UT) a

IN

OUT

frequency or a pulse rate. Refer to “Operation”.

accessories. Refer to the datasheet.

24V source, and to do switch tests.

A1 A2

To start - Items on the display

Item Description

16. DPI 842 only. Task indication for the switch test.

17. DPI 842 only. The loop power supply is on.

18. The measured value satisfies one of the alarm

19. The data on the display is on hold. To continue, press

20.

21. Identifies the type of data and the measurement

22. ... 24. The settings applied to the input or output.

22. kHz The units or a speci fied scale (x:y) - (Table 4/5)

5.0V

23.

24. = Filter

25. A soft-key function. To select an available function,

26. The measured value or values applicable to the task

27. The Edit display to set up text labels ( ≤ 6 characters):

= switch closed

UPM only. Task indication for the leak test.

Refer to: Select Task (Table 2/3)

Refer to: Select Task (Table 2/3)

conditions. Refer to: Settings (Table 4)

the HOLD button again.

Shows the battery level: 0 ... 100%.

range.

= Input = Output
= IDOS input

Refer to: Select Task (Table 2/3)

, , =

...V The input trigger level (Table 4) or the output

amplitude (Table 5).

, ... ,

= Tare

press the soft-key below it. Example:

= Move left = Move right

selection.

x:y Scaling (Table 4).

OK = Accept the new text label

Shift = Change the keys: 123ABC or -_+abc

= Add a space

BS = Back space (Delete character)

A3

= switch open

Output waveform (Table 5)

= Output operation (Table 5)

= Maximum
= Average
= Minimum

(Table 4)

To start - Prepare the instrument

Before you use the instrument for the first time:

• Make sure that there is no damage to the instrument,
and that there are no missing items.

• Remove the plastic film that protects the display. Use
the tag (◗ ) in the top right-hand corner.

• Install the batteries (refer to B1). Then re-attach the
cover.

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To start - Power on or off

To turn the instrument on or off, press ❍ (A1 - item [1]). Th e
instrument does a self test and then shows the applicable
data.
When the pow er is off, the last set of con figuration options
stays in memory. Refer to “Maintenance”.

To start - Set up the basic operation

Use the Set Up menu to set up the basic operation of the
instrument.

Menu:

1

Select Task

(Table 2) (Table 1) [✓]/[ ]

23

▲
▼

Menu:
Set Up

45

▲
▼

If there is additional data for a menu option, select
Settings (■■

) to see the values that are set up. If

necessary, adjust the values.

Table 1: Menu options - Set Up

Options

(If applicable)

Descript ion

DPI 842 only. To add a series resistor into the mA
circuit. You can then use this instrument together
with a HAR T® communic ator to set up and
calibrate HART® devices.

To select and set up the backlight facility + timer.
Additional data: Select Settings (■ ■)
To select and set up the power off facility + timer.
Additional data: Select Settings (■ ■)

To show the battery level (%).

To set the display contrast (%).
▲ Increases %, ▼ decreases %
To set the time + date. The calibration facility uses
the date to give service and calibration messages.
To set the language option.

To calibrate the instrument.

Additional data: Refer to “Calibration”.

To select and show the applicable status data.
(Software Build, Calibration Due date, Serial
Number, IDOS Information).

To start - Select a task (Measure and/or supply)

When the instrument is set up (Table 1), use the Select Task
menu to select the applicable task.

1

Menu:

Select Tas k

(Table 2/3)

23

▲
▼

Display:

Hz output

Sk1 = Edit
Sk2 = Settings

In Table 2/3, IDOS is a Universal Measurement Module
(UMM). If you attach a UMM to the communications port
(A1 - item [9]), the Select Task menu shows the applicable
IDOS options.

Table 2: Menu options - Select Task

Options

(If applicable)

IDOS UMM only. An IDOS measurement task.

UPM only. A leak test.

Description

Hz or

An input measurement task:

Pulses

Hz - Measure the frequency
Pulses - Count the number of pulses

Hz or

An output task:

Pulses

Hz - Supply an output frequency

Pulses - Generate a specified number of pulses
mA DPI 842 only. A mA measurement task.
mA(24V) DPI 842 only. A mA measurement task + the loop

power supply is on .

DPI 842 only. A switch test.

To set up the way the instrument works.

Additional data: Refer to: Set Up (Table 1) .

Table 3 shows all the one and two function operations that
are available. If you attach a UMM, you can only use the
options that include IDOS.

Table 3: Permitted 1 and 2 function operations

Function

mA (1) x (2) x x (2)
mA(24V) (1) x (2) x x (2)

IDOS (1) (2) (2) (2) x x

Hz Hz Pulses Pulses IDOS
(1) (1) (1) (1) (1)

x x (2) x x (2)
xxxxx(2)

= DPI 842 only

[EN] English - 3K395 Issue 1

To start - Set up the settings

When the task is set up (Table 2/3), use the Settings menu
to adjust the input and/or output operation.

Display: Task

Hz + mA

Sk1 = Start/Stop
Sk2 = Settings

Menu:

Settings

(Table 4) [✓]/[ ] Sk1 = Edit

Menu:

Settings

(Table 5) [●]/ [ ]

Settings selection

1

■ ■

4A 5A 6A

▲
▼

4B 5B

▲
▼

(If applicable)

■ ■

23

▲
▼

Settings

x:y

If there is additional data for a menu option, select
Settings (■■

) to see the values that are set up. If

necessary, adjust the values. Refer to “Edit functions”.

Table 4: (Part of table) Menu options - Settings (Input)

Options

(If applicable)

Trigger level To set the amplitude at which the instrument

Description

... Units Frequency Units (Hz input only). To select one of

these units:
Hz: Range < 1000Hz kHz: Range 1 ... 50kHz
Pulses/minute (cpm) Pulses/hour (cph)

... Units UPM only = “Pressure Units” if you select an IDOS

task (Table 2/3). Select one of the fixed units of
measurement (psi, mbar ... ).

senses a frequency signal. Default = 5V.
Auto Detect [✓]/[ ]: Set this option to make the

instrument calculate the value from the available
signal.
To include maximum, minimum and average
values for the measurement task.

Table 4: (Part of table) Menu options - Settings (Input)

Options

(If applicable)

Description

To select and set up a tare value for the
measurement tas k (a specified value or the reading
on the display).
The instrument subtracts a positive tare value, and
adds a negative tare value.

Additional data: Select Settings (■ ■)
To select and set up a scale of values: One local
scale for each measurement task (Maximum: 5).
Additional data (Example 1/2): Select Settings (■ ■)
To select and set up the filter values to give a
smoother output for the measurement task:

Band as a % of full scale (FS). The filter

compares each new value with the previous
value. If the new value is outside the band, it is not
filtered.

Low pass filter time constant in seconds.

Increase the value to increase damping
factor.
Additional data: Select Settings (■ ■)
To select and set up the alarm values for the
measurement task (maximum and minimum).

Additional data: Select Settings (■ ■)
UPM only. Gage sensors or sensors with differential

operation. A zero correction that makes the
instrument read zero at local pressure.
Leak Test only. To set an applicable period for the
leak test (Hours:Minutes:Seconds).

To start - Edit functions

Example 1) Set up a label for x:y Scaling = %.

Settings

x:y

Sk1 = Edit A3 - item [27]

1 Edit 2 Edit 3

▲

■ ■

Edit ... Edit 45

A3 - item [27]

Shift

▼

■ ■

%_

▲

OK

▼

■ ■

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Example 2) Set up values for x:y Scaling = 0 to 100%.

Settings

x:y

Sk1 = Edit

Settings

1

▲
▼

= Flow scaling (mA, pressure only)

2 Edit 34

x:y

■ ■

▲
▼

■ ■

Table 5: (Part of table) Menu options - Settings (Output)

Options

Amplitude To set the amplitude and the mode of the output

Waveform To set the waveform for the output signal:

Descript ion

Hz

... Units Frequency Units. To select one of these units:

Hz: Range < 1000Hz kHz: Range 1 ... 50kHz
Pulses/minute (cpm ) Pulses/hour (cph)

signal. Amplitude = 5V (Default).
Bipolar mode [✓]/[ ]: Set this option to make the
signal pass thru zero.

= Unipolar = Bipolar

,,

To select and set up a value f or the “Nudge” output.
Example: 0.010 kHz incremen ts.
Additional data: Select Settings (■ ■)

To select and set up values for the “Span Check”

output. Example output cycle:

Additional data (Table 6): Select Settings (■ ■)
To select and set up values for the “% Step” output.

% Step

Example output cycle:

Additional data (Table 6): Select Settings (■ ■)

= Sine, square, or triangle

This cycle repeats
automatically.

Auto Repeat - Opt ional

Table 5: (Part of table) Menu options - Settings (Output)

Options

To select and set up values for the “Ramp” output.

Options

Description

Hz

To select and set up values for the “Defined Step”

... Step

output. Example output cycle:

Additional data (Table 6): Select Settings (■ ■)

Example output cyc le:

Additional data (Table 6): Select Settings (■ ■)

Description

Pulses

Counts: To set the total number of output pulses.
Rate: To set the frequency of the output.
Amplitude: To set the amplitude of the output

signal. Amplitu de = 5V (Default).
Bipolar mode [✓]/[ ]: Set this option to make the
signal pass thru zero.

= Unipolar = Bipolar

Auto Repeat - Optional

Auto Repeat - Optional

Table 6: Additional data for Settings (Output):

Item Value
Span Check

Low (0%) Set th e 0% value.
High (100%) Set th e 100% value.
Dwell (d) Set the per iod (Hours:Minutes:Seco nds) between

% Step Low (0%), High (100%), Dwell (d): As above.
Step Size (s) ... %Set the change in value for each step as a

Defined Step Low (0%), High (100%), Dwell (d): As above.
Step Size (s) Set the change in value for each step as a

Ramp Low (0%), High (100%), Dwell (d): As above.
Travel (t) Set the period (Hours:Minutes:Secon ds) to go from

Auto Repeat If applicable, select this ite m to repeat a cycle

each change in value.

percentage of the full-scale range (High - Low).

frequency value.

the Low (0%) value to the High (100%) value.

continuously.

[EN] English - 5K395 Issue 1

Operation

This section gives examples of how to connect and use the
instrument. Before you start:

• Read and understand the “Safety” section.

• Do not use a damaged instrument.

Operation - Frequency connections

To prevent instrument errors, make sure that the
frequency connections (A1-item [10]) are correct.

Operation - Communications port connections

Use the communications port (A1 - item [9]) to attach an
IDOS Universal Measurement Module (UMM).
When you attach the cable from a UMM (Figure 7/8), the
instrument automatically changes the menus to give you
all the applicable options (Table 2/3).

Operation - Measure Hz or count pulses

To measure Hz or count pulses:

1. Connect the instrument (Figure 1) and, if necessary,
adjust the Set Up (Table 1).

2. Select a Hz or Pulses input task from Select Task
(Table 2/3) and, if necessary, adjust the Settings
(Table 4).

3. For Pulses, use Start/Stop (■
count. The display shows the time (hh:mm:ss) since you
started the count.

■) to start and stop the

Operation - Change the output values

When the output operation is set up (Table 5), use one of
these procedures to change the output values:

Table 7: Procedures to change the output

Output Procedure

,

,

Pulses

Select Edit (■ ■) and/or use the ▲ ▼ buttons.
See the example below.
Select Start/Stop (■ ■) or use the ▲ ▼ buttons
to make the step changes manually.
Select Start/Stop (■ ■).

Example procedure (“Nudge” output):

Display:

Hz output

Sk1 = Edit
Sk2 = Settings

Display:

Hz output

1 Edit 23Edit 4

▲

■ ■ ■ ■

56

▲
▼

▲

1.010

▼

Increment = 0.010

(Table 5)

1.020

▼

+01.000

Pulses

SettingsStartSettings

a) Hz b) Pulses

Figure 1: Example configuration - To measure Hz

or count Pulses

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Operation - Supply Hz or pulses

To supply Hz or pulses:

1. Connect the instrument (Figure 2) and, if necessary,
adjust the Set Up (Table 1).

2. Select a Hz or Pulses output task from Select Task
(Table 2/3) and, if necessary, adjust the Settings
(Table 5).

For Pulses, the display shows the time (hh:mm:ss) to
complete the count at the specified rate.

3. Supply the output values to the system (Table 7).

Pulses

Maximum: 30V

Edit Settings

Pulses

Edit Settings Start Settings

a) Hz b) Pulses

Figure 2: Example configuration - To supply Hz or Pulses

Operation - Transmitter calibration

DPI 842 only. To calibrate a transmitter:

1. Connect the instrument (Figure 3/4) and, if necessary,
adjust the Set Up (Table 1).

2. Select the applicable calibration task from Select Task
(Table 2/3) and, if necessary, adjust the Settings
(Table 4/5).

3. Supply the output values to the system (Table 7).

Figure 3: Example configuration - Transmitter calibration

with external loop power

Edit Settings

Figure 4: Example configuration - Transmitter calibration

with internal loop power

[EN] English - 7K395 Issue 1

Operation - mA measurements

DPI 842 only. To measure a current:

1. Connect the instrument (Figure 5) and, if necessary,
adjust the Set Up (Table 1).

2. Select the applicable mA input task from Select Task
(Table 2/3) and, if necessary, adjust the Settings
(Table 4).

Maximum: 30V

Settings Settings

a) with external loop

power

b) with internal loop

power

Figure 5: Example configuration - mA measurement

Operation - Switch test

DPI 842 only. To do tests on a frequency operated switch:

1. Connect the instrument (Figure 6) and, if necessary,
adjust the Set Up (Table 1).

2. Select the applicable switch test from Select Task
(Table 2/3) and, if necessary, adjust the Settings
(Table 5). The display shows the switch condition (open
or closed) in the top right-hand corner.

3. Supply the output values to the system (Table 7).

• Example - “Nudge” output.

a. Use Edit (■

■) to set a value less than the switch

value.

b. Use the ▲ ▼ buttons to change the value in small

increments.

• Example - “Ramp” output.
a. Set “High” and “Low” values that are applicable to

the switch value (Table 6). Then, to get an accurate
switch value, set a long “Travel” period.

b. Use Start/Stop (■

■) to start and stop the “Ramp”

cycle.

4. If necessary, supply the output values in the opposite
direction until the switch changes condition again.

The display shows the applicable values to open and
close the switch.

5. To do the test again, press ESC to reset the values.

Edit Settings

Figure 6: Example configuration - Switch test

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Operation - UPM Pressure measurements

Read all the instructions supplied with the UPM and then
use the specified procedures to connect it (Figure 7/8).

Settings

a) Pressur e b) Leak test

Start Settings

Figure 7: Example configuration - Pressure measurement

with a UPM

When the connections are complete, make the necessary
IDOS selections (Table 2/3).
If you re-attach a UPM, the instrument uses the same
measurement units that you used before. The instrument
keeps a record for the last 10 modules.

UPM - Measure the pressure

To measure the pressure (Figure 7):

1. Select the applicable pressure task from Select Task
(Table 2/3) and, if necessary, adjust the Set Up (Table 1),
and the Settings (Table 4/5).

2. If necessary, do a zero correction (Table 4).

To measure pressure with another operation (Figure 8), use
the same procedure.

Settings

Figure 8: Example configuration - To measure pressure

and frequency

UPM - Leak test

To do a leak test on a pressure system (Figure 7):

1. Select an applicable leak test from Select Task
(Table 2/3) and, if necessary, adjust the Set Up (Table 1),
and the Settings (Table 4).

2. Set the period for the leak test (Table 4).

3. If necessary, do a zero correction (Table 4).

4. To start the leak test, select Start (■

■). When the test is

finished, the instrument calculates the leak rate in the
applicable units/minute.

Operation - Error indications

If the display shows <<<< or >>>> :

• Make sure that the range is correct.

• Make sure that all the related equipment and
connections are serviceable.

[EN] English - 9K395 Issue 1

Maintenance

This section gives procedures to maintain the unit in a
good condition. Return the instrument to the supplier for
all repairs.

Maintenance – Clean the unit

Clean the case with a moist, lint-free cloth and a weak
detergent. Do not use solvents or abrasive materials.

Maintenance – Replace the batteries

B1

To replace the batteries, refer to B1. Then re-attach the
cover.
Make sure that the time and date are correct. The
calibration facility uses the date to give service and
calibration messages.
All the other configuration options stay in memory.

Calibration

Note: GE can provide a calibration service that is traceable
to international standards.

We recommend that you return the instrument to the
manufacturer or an approved service agent for
calibration.
If you use an alternative calibration facility, make sure that
it uses these standards.

Calibration - Before you start

To do an accurate calibration, you must have:

• the calibration equipment specified in Table 8.

• a stable temperature environment: 70 ± 2°F (21 ± 1°C)

Function Calibration equipment

Hz 1) Frequency meter

Pressure UPM only. Refer to the user manual for the IDOS

mA mA calibrator.

Amplitude (V) 1) Frequency meter

Before you start the calibration, make sure that the time
and date on the instrument are correct (Table 1).

Table 8: Calibration equipment

(ppm = parts per million)

Total error: 7 ppm or better
Resolution: 8 digits (minimum)

2) Signal generator

UPM.

Accuracy: Refer to Table 11.

Total error: 7 ppm or better
Resolution: 8 digits (minimum)

2) Digital volt meter (DVM)

Selection sequence:

➤

Select Task (Table 2) ➤ Set Up (Table 1) ➤ Calibration ➤.

Display: Enter

1

Calibration PIN

Factory PIN = 4321 (Table 9)

23

▲
▼

+

■ ■

Menu:

Select Channel

45

▲
▼

Table 9: Calibration options

Options Description

Hz To calibrate the input or output frequency.
... Amplitu de. To select and calibrate the output

amplitude for the Square Wave and then the
Sine/Triangular Wave.

IDOS ... UMM only. To calibrate the specified IDOS UMM.

Refer to the user manual for the IDOS UMM.

mA DPI 842 only. To calibrate the mA input.

Calibration Due: To set the date of the next
calibration for the instrument.
After the specified calibration date, there is a
warning message. There is a selection box to stop
the warning.
To change the calibration PI N (Personal
Identification Number).

When you select a channel, the display shows the
applicable instructions to complete the calibration.
When the calibration is complete, select Calibration Due
and set the new calibration date for the instrument.

Calibration - Procedures (Hz - input/output)

1. Connect the instrument to the calibration equipment
(Figure 1).

2. Let the equipment get to a stable temperature
(minimum: 5 minutes since the last power on).

3. Set up the equipment with these conditions:

Frequency meter: Gate time = one second
Signal generator: Output = 10V, unipolar,

square wave
Frequency = 990 Hz

DPI 841/842: Input units = Hz (Table 4)

Input trigger level = 5V (Table 4)

4. Use the calibration menu (Table 9) to do the calibration.
The display shows the applicable instructions to
complete the calibration.

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5. To make sure that the calibration is correct, set up the
equipment to do one of these calibration checks:

• Hz input calibration check (Figure 1):

Frequency meter: Gate time = one second
Signal generator: Output = 10V, unipolar,

square wave

DPI 841/842: Input trigger level = 5V (Table 4)

Units (Table 4): Hz or kHz as
specified in Table 10.

• Hz output calibration check (Figure 2):

Frequency meter: Gate time = one second
DPI 841/842: Units (Table 5): Hz or kHz as

specified in Table 10.

6. Measure or supply the specified values (Table 10): Hz
then kHz. Make sure that the error is in the specified
limits.

Table 10: Hz error limits (Measure/Supply)

Measure/
Supply

Hz kHz

25 0.002 0.0014 2.5000 0.0002 0.000042
100 0.002 0.0021 10.0000 0.0002 0.000112
250 0.004 0.0035 20.0000 0.0003 0.000205
500 0.006 0.0058 30.0000 0.0004 0.000298
990 0.011 0.0104 50.0000 0.0006 0.000483

Permitted
DPI 841/842
error (Hz)

Measure/
Supply

Permitted
DPI 841/842
error (kHz)

Calibration - Procedures (mA input)

1. DPI 842 only. Connect the instrument to the calibration
equipment (Figure 5).

2. Let the equipment get to a stable temperature
(minimum: 5 minutes since the last power on).

3. Use the calibration menu (Table 9) to do a three-point
calibration (-FS, Zero and +FS). The display shows the
applicable instructions to complete the calibration.

4. To make sure that the calibration is correct, select the
applicable mA input task (Table 2) and apply these
values:

• mA: -55, -40, -24, -18, -12, -6, 0 (short circuit)
Then mA: 0, 6, 12, 18, 24, 40, 55.

5. Make sure that the error is in the specified limits
(Table 11).

Table 11: mA input error limits

Applied
mA

±55 0.0022 0.005
±40 0.0018 0.004
±24 0.0014 0.003
±18 0.0004 0.003
±12 0.0003 0.002
±6 0.0002 0.002
0 (Short circuit) - 0.001

Calibrator
error
(mA)

Permitted
DPI 841/842 error
(mA)

Calibration - Procedures (Amplitude output)

1. Connect the instrument to the calibration equipment
(Figure 2).

2. Let the equipment get to a stable temperature
(minimum: 5 minutes since the last power on).

3. Set up the DPI 841/842 with these conditions:

Output Hz = 0 (For direct current output)
Output amplitude: Set to Unipolar (Table 5)
Output waveform = Square Wave (Table 5)

4. Use the calibration menu (Table 9) to do the Square
Wave calibration. The display shows the applicable
instructions to complete the calibration.

Calibration values: Low = 0.1V, High = 20V

5. Change the output waveform to Sine Wave (Table 5).

6. Use the calibration menu (Table 9) to do the
Sine/Triangular Wave calibration. The display shows
the applicable instructions to complete the calibration.

Calibration values: Low = 0.1V, High = 20V

[EN] English - 11K395 Issue 1

7. To make sure that the calibration is correct, set up the
DPI 841/842 with these conditions:

Output Hz = 0 (For direct current output)
Output amplitude: Set to Unipolar (Table 5)

8. Supply the specified values (Table 12): Square Wave
then Sine Wave. Make sure that the error is in the
specified limits.

Table 12: Amplitude output error limits

Amplitude
Volts (V)

0.1 0.05

1.0 0.10

10.0 0.10

15.0 0.15

24.0 0.24

Permitted
DPI 841/842 error
(V)

Calibration - Procedures (IDOS UMM)

Refer to the user manual for the IDOS UMM.
When the calibration is complete, the instrument
automatically sets a new calibration date in the UMM.

Specification data

All accuracy statements are for one year.

Specification - General

Languages English [Default]
Operating
temperature
Storage
temperature
Humidity 0 to 90% without condensation

Shock/Vibration BS EN 61010:2001; Def Stan 66-31, 8.4 cat III
EMC BS EN 61326-1:1998 + A2:2001
Safety Electrical - BS EN 61010:2001; CE Marked
Size (L: W: H) 7.1 x 3.3 x 2.0 in

Weight 14 oz (400 g)
Power supply 3 x AA alkaline batteries
Duration
(Measure)
Duration
(Supply)

14 … 122°F (-10 … 50°C)

-4 … 158°F (-20 … 70°C)

(Def Stan 66-31, 8.6 cat III)

(180 x 85 x 50 mm)

Hz, pulses: ≈ 60 hours
mA: ≈ 35 hours
Hz, pulses: ≈ 20 hours
mA: ≈ 10 hours (24 V Sour ce at 12 mA)

Specification - Frequency

cpm = Pulses/minute, cph = Pulses/hour

Range (Measure): Accuracy:

0 ... 999.999 Hz
1 ... 50.0000 kHz
cpm: 0 ... 99999
cph: 0 ... 99999

Range (Supply): Accuracy:

0 ... 999.99 Hz
1 ... 50.000 kHz
cpm: 0 ... 99999
cph: 0 ... 99999

Temperature coefficient
14 … 50°F, 86 … 122°F
(-10 … 10°C, 30 … 50°C)

Waveform
(Sine, square, triangle)

Voltage input 0 ... 30 V
Trigger level 0 ... 24 V, Resolution: 0.1 V
Output amplitude 0 ... 24 V dc ± 1%

Connectors (A1 - Item 10) Four 0.16 in (4 mm) sockets

For all the ranges:

0.003% of reading + 2 counts

0.003% of reading + 0.0023 Hz

0.003% of reading + 0.0336 Hz

0.003% of reading + 0.138 cpm

0.003% of reading + 0.5 cph

0.0011% FS / °F
(0.002% FS / °C)

Unipolar
Bipolar

0 ... 24 V ac ± 5% (Current ≤ 20 mA)

Specification - Electrical connectors (A2)

Range (Measure) 0 to ±55 mA
Accuracy 0.02% of reading + 3 counts
Temperature coefficient
14 … 50°F, 86 … 122°F
(-10 … 10°C, 30 … 50°C)
Switch detection Open a nd closed. 2 mA current.
Loop power output 24 V ± 10%

HART® resistor
Connectors (A2) Three 0.16 in (4 mm) sockets

0.0011% FS / °F
(0.002% FS / °C)

250 Ω (menu selec tion)

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

12 - [EN] English K395 Issue 1

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