24
Charge Analyzer 711 Internal Sensor
1. Mount the cup electrode (a) to the top of the Charge
Analyzer 711 and perform the zeroing function
described in Section 5. Voltmeter Operation/Setup.
2. Connect a lead wire between the ground jack of the
unit and the low/return side of the DC high voltage power supply.
3. Connect a lead wire between the DC power supply output connection and the
banana jack of the cup electrode (a).
4. Connect remaining two wires between the digital voltmeter (± voltage inputs)
and the red/black banana jacks (analog output) at the rear of the Charge
Analyzer 711. (Select meter scale ± 2vdc)
5. Select the proper range on the unit, apply DC high voltage power supply to
each full range, (25 VDC, 100VDC, 500VDC, 1,000VDC, and 5,000VDC).
Verify that the display indicates within ± 2.5% of full range. See verification
check list form on next page.
Note: Also verify during Step 5 that the analog output is within tolerance. Input to output ratio
for each voltage range is as follows:
3M
™
Charge Analyzer 711
Voltage Range Setting
Ratio Input to Analog Output
Multiply analog output voltage by the
appropriate value below to obtain 3M
™
Charge Analyzer 711 input value
Decimal Value
Multiply input voltage to the
3M
™
Charge Analyzer 711
by the appropriate factor below to
obtain analog output value
25Vdc
12.5 to 1
0.08
100Vdc
50 to 1
0.02
500Vdc
500 to 1
0.002
1,000Vdc
500 to 1
0.002
5,000Vdc
2500 to 1
0.0004
6. Repeat Step 5 for Negative voltages.
IMPORTANT NOTE
Do not discharge to the
sensor element.
