Martel IVC-222HPII Reference Manual

IVC-222HPII

Precision Voltage/Current

Calibrator

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Table of Contents

1. Introduction

1.1 Customer Service . . . . . . . . . . . . . . . .2

1.2 Unpacking . . . . . . . . . . . . . . . . . . . . .2

2. Operating Procedure . . . . . . . . . . . . . . .3

3. Operating Considerations and

Precautions . . . . . . . . . . . . . . . . . . . . . . .4

4. Accuracy . . . . . . . . . . . . . . . . . . . . . . . . .6

5. Maintenance . . . . . . . . . . . . . . . . . . . . . .7

6. Rechargeable Battery Option . . . . . . .7

7. Specifications . . . . . . . . . . . . . . . . . . . .8

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1

IVC-222HPII

WARNING

Before attempting to interface the

IVC-222HPII with any other device, carefully

read the following instructions.

1. Introduction

The Martel Model IVC-222HPII is designed to
be a simple, low cost voltage/current calibrator
for field and laboratory purposes. It combines
the latest digital and analog circuitry to achieve
its rated specifications in a small, reliable pack­age.

The unit is capable of sourcing at ranges of
200mV, 2V, 20V, and 24mA. Each range is dis­played on the LCD readout. Upon power-up,
the Model IVC-222HPII will return to the range
selected before the unit was turned off.

This unit has the capability to store and recall
up to two values in the setpoints provided by
the SP1 and SP2 keys.

The keys and the s t keys help
achieve needed values by selecting and scroll­ing digits.

The IVC-222HPII has an RS-232 jack which can
be accessed via a custom interface cable avail­able from Martel.

s

s

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2

1.2 Unpacking

1. Upon receipt of shipment, inspect the

container and equipment for any signs of
damage. Take particular note of any
evidence of rough handling in transit.
Immediately report any damage to the
shipping agent.

NOTE: The carrier will not honor any claims
unless all shipping material is saved for their
examination. After examining and removing
contents, save packing material and carton in
the event re-shipment is necessary.

2. Remove the Packing List and verify that all

equipment has been received. If there are
any questions about the shipment, please
call Martel Electronics at 800-821-0023.

Set-up

Become familiar with the designations and
polarities of the four output jacks located on the
top of the calibrator. Refer to the back panel
label for polarity information.

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2. Operating Procedure

1. After power-up, select the desired output

range. The 200mV, 2V, 20V, and 24mA
ranges can be selected by pressing the
RANGE key until the desired range is
shown on the LCD readout.

2. Observe the proper polarity when

connecting the output jacks. Red is (+)
and Black is (-).

3. Adjust output using the control keys.

When pressed, the keys select a
digit on the LCD readout to be scrolled.
When these keys are pressed and held
down, a blinking cursor appears and
covers up one of the digits indicating which
digit is selected. After a second more, the
cursor starts to move in the direction
selected.

The s t keys scroll the digit up or
down, respectively. As the outputs are
scrolled, the integral LCD readout displays
the voltage or current present at the output
jacks.

4. The SP1 or SP2 keys will store or recall a

value when pressed.
To store a value in SP1 or SP2, scroll to the

desired output. Press and hold down the
SP1 or SP2 keys until the word “STORED”
flashes onto the LCD readout.

To recall a value in SP1 or SP2:
momentarily press the SP1 or SP2 keys,
and the value needed from that particular
setpoint should appear on the LCD display.

5. The voltage output jacks are disabled while

in the current output mode. Likewise, the
current output jacks are disabled when in

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the voltage output mode. Therefore, only
one type of output, either voltage or current
can be simulated at one time.

6. The purpose of the RS-232 jack on the

IVC-222HPII is to allow data from the IVC­222HPII to be transferred to a data
collection device such as a PC or a printer.
When connecting the IVC-222HPII to a
computer, the following specifications will
apply:

a. Baud Rate 2400
b. 8 data bits with 1 stop bit
c. No Parity

Other commands can be sent to the IVC­222HPII from the computer to do all of the
functions such as range change, output
adjust, setpoint control, etc.

NOTE: A custom RS-232 cable from Martel

Electronics will be needed. The
part number is C232SJ and can be
ordered directly from Martel.

When connected to a computer, the IVC­222HPII will begin to send data as soon as
the calibrator is turned on.

3. Operating Considerations

and Precautions

1. While operating in the voltage mode, the

calibrator’s output circuitry can sink or
source up to 1mA max. Loads greater than
1mA may cause the calibrator to drop out
of its accuracy specification. (See Figure 1)

When there is an excessive load, the word
“OVERLOAD” will appear intermittently on
the LCD readout. Long term short circuit

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conditions will not harm the calibrator but
will cause the battery to decay. Maximum
short circuit is 25 mA.

Figure 1

IVC-222HPII operating as a Precision Voltage

Source

2. In the current mode, the maximum load

driving capacity of the IVC-222HPII is 1000
ohms. If connections to the mA jacks are
open or the load is greater than the
compliance voltage while trying to source a
current, the word “OPEN LOOP” will
appear intermittently on the LCD readout.
(See Figure 2)

Figure 2

IVC-222HPII operating as a Current Source

3. Current loop devices that derive their power

supply from an external power supply can
be calibrated as shown in Figure 3.

5

(+)

−

−

Volts

Volts

Max. Load

+

+

+

−

mA

+

−

mA

1 mA

O to 24mA

up to

1000 ohms

Unit

Under

Test

Unit

Under

Test

(–)

(+)

(–)

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Figure 3

IVC-222HPII indicating current using an

external power supply

4. This instrument is equipped with an

automatic low battery indicator. When the
LCD “BAT” indicator appears, the battery
should be replaced immediately so that the
calibrator’s output accuracy is maintained.

4. Accuracy

The IVC-222HPII is checked against an NIST
traceable reference before shipment to verify
that each range falls within the .015%, ±2
counts of accuracy specification. Long term
accuracy, beyond one year, should remain
within .030%, ±2 counts of FSR. All of these
ratings are based on a 18°C to 28°C ambient
temperature.

From 18°C to 0°C and from 28°C to 50°C, there
is an accuracy change of .005% of full scale per
°C. Therefore, allowances must be made for
error caused by wide temperature variations.

6

(+)

−

Volts

Power

Supply

+

+

−

mA

4 to 20mA

(+)

Unit

Under

Test

30 Volts

Max.

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5. Maintenance

Generally, with normal usage, the calibrator
should hold its rated specifications for at least
12 months. Beyond this, it should be returned
for re-calibration annually. If after the stated
warranty period, the device falls out of
calibration, or needs repair, it can be returned

6. Rechargeable Battery

Option

When continual service is required, a
rechargeable “NI-Cad” 9V battery and wall
mount AC adapter/charger may be purchased.
The AC adapter may be left on continually to
keep the charge up on the battery while the
instrument is in use or can be used to recharge
a low battery over a 12-14 hour period. The AC
adapter/charger can also be used solely as an
AC power supply without battery installed.

When using the “Ni-Cad” battery, it is advisable
to occasionally allow the instrument to operate
until the “BAT” indicator appears then recharge.
This procedure will cycle the battery and
prevent any “memory” effects that are
associated with this type of battery.

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7. Specifications

Voltage Output mA Output
Output Range: 200mV 2V 20V 24mA
Resolution: 0.01mV 0.1mV 1mV 1mA
Accuracy: 18°C to 28°C:

All voltage ranges:

±0.015% of Reading ±2 count

Current range 0 to 20mA:

±0.015% of Reading ±2 count

Current range above 20mA:

±0.030% of Reading ±2 count

Temperature 0 to 18°C
Stability: 28 to 50°C

±50 ppm/C degrees

Load Capability: ±1mA for rated 1000 ohms

accuracy

Capacitive Load: No limitations N/A
Output Protection: Current limited Internal Resettable fuse
Power: 9V Alkaline battery or optional NiCd
Case Dimensions: 1.43" x 3.15" x 5.7"
Weight: 12 oz.

Specifications subject to change without notice

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