Table 1. Connector Pin Information
1. Signal HI 6. Signal LO
2. Key 7. Ground
3. N/C 8. N/C
4. N/C 9. +5Vdc
5. N/C 10. Ext. Ref.
Operation
1. Connector. The connector (purchased
separately) after assembling, is plugged onto
pins at rear of meter. Line up connector key
with missing pin in position 2. Pin 1 in Figure
3 is the pin that's by itself. Pin 2, 3, 4 and 5
are not installed on the PC board of the
meter.
2. Power Supply. Connect the negative
side of the +5 Vdc power supply to pin 7 of
the connector and the positive side to pin 9.
3. Signal. For most applications it is
desirable to have SIGNAL LO (Pin 6)
connected to power ground (pin 7).
As shipped, the meter makes this
connection with a printed circuit trace
labeled "W1." Connect signal HI and signal
LO of the source to pins 1 (HI) and 6 (LO)
respectively of the meter. A shielded cable
may be required if the signal source has a
high resistance. If there is any connection
between source LO and power ground
(other than W1), and if instability is observed
in the least significant digits of the display,
this instability may be improved by cutting
the W1 PC trace.
4. Decimal Location. Depending upon
which decimal point is to be illuminated,
install a jumper wire between circuit board
C and circuit board L, M or R on the inside
of the meter, See below:
Decimal Location X .X . X .
Pad Location L M R
5. Readings. With +5 Vdc power and
positive signal voltage applied (within range
of meter) , the X-32 will display the correct
reading + 0.1% within 10 seconds.
Ratio Operation
For ratio measurement applications, an
external reference voltage may be used as
follows: (In the ratio mode, the calibration
potentiometer, R2, has no effect.)
Remove jumper W2 by cutting
PC trace.
Install jumper W3. (See Figure 3)
Connect an external reference
voltage of +0.1 volt +10% to pin 10.
Voltage Range Modification
The X-32 may be range-changed from
any range to another by the installation
of various precision resistors.
1. Remove faceplate in front of display by
pressing in on sides of bezel and pulling
faceplate out by bowed center. Remove two
screws located at either end of display.
2. Carefully remove meter from front
of case.
3. Observe resistor values that are in meter
and compare to figure 3 and table II. Install
resistors specified in table II to attain desired
range.
Table II.
Resistor Values in
Range Modification Kit
Range 100mV 1V 10V 100V 1000V
R8 - 100k 10k 1k 402
R9 Jumper 909k 1M 1M -
R10 - - - - 1M
R11 - - - - 1M
R12 - - - - 1M
R13 - - - - 1M
4. If a decimal point is desired, see #4 under
Operation.
5. Clean solder joints & adjacent areas on
printed circuit board to minimize leakage
paths.
6. Reassemble meter.
7. Calibrate meter , see Calibration section.
8. Range change modification are available,
(NLS P/N 53-107).
Calibration
1. Set power supply voltage +5Vdc +2%.
2. Allow 5 minutes for warm up.
3. Precision DC power supply voltages:
Range of Recommended
Instrument Calibration Voltage
100 mV 90 mVDC
1 V 900 mVDC
10 V 9.00 VDC
100 V 90.0 VDC
1000 V 900 VDC
4. Adjust potentiometer R2 at side of
meter until readout agrees with input.
Figure 3. Component Location
Current Operation
Current Range Kit NLS P/N 53-108
provides all the resistors required to
measure DC currents. The meter must be in
the 100 mV range to accomplish this. Refer
to Figure 3 & 4 and Table III, for position of
R14. Higher currents are measured by
using an external current shunt. See
Table III for resistor values.
(Call factory for requirements)
Warning: This meter is frequently
used on the high side of the current
source to be measured. This
arrangement may cause a short
between the circuit high side and
ground with possible damage to the
meter and circuit. To prevent this, an
isolated meter power supply is
recommended.
Table III. Shunt Resistor Values
Full Scale Shunt Resistor
Current Range Value
100 Nanoamperes 1 Megohm
1 Microampere 100 Kilohms
10 Microamperes 10 Kilohms
100 Microamperes 1 Kilohm
1 Milliampere 100 Ohms
10 Milliamperes 10 Ohms
100 Milliamperes 1 Ohm
1 Ampere 0.1 Ohm
Figure 4. Current Shunt Location
Specifications Subject to Change
without Notice
Non-Linear Systems
Originator of the digital voltmeter.
San Diego, CA
P: 619-521-2161
F: 619-521-2169
sales@nonlinearsystems.com
11-14
