Front Panel Operation
Sample Applications 4
4-61
Table 4-6. 8840A Offset and Gain Calibration Prompts
Step Displayed Prompt
VDC VAC (1) 2-Wire kΩ
4-Wire kΩ
mA DC mA AC (1)
A +0.00 mV DC (short) 10.0 mV AC 0.00Ω (short) 0.0 mA DC (open) 100 mA AC
B +190.0 mV DC 100.0 mV AC 100.0Ω 1000 mA DC 1000 mA AC
C +1.900V DC 1.000V AC 1.000 kΩ
D +19.00V DC 10.00V AC 10.00 kΩ Steps C through G
E +190.0V DC 100.0V AC 100.0 kΩ not applicable for these functions.
F +1000V DC 500V AC 1000 kΩ
G Step G not applicable for these functions 10.00 MΩ
1. Inputs should be at 1 kHz ±10%. Performance may be enhanced for specific frequencies (see 8840A
Operators Manual for more information).
5. After the last range is calibrated, the 8840A begins taking readings in the highest
range so that you may verify its calibration. (The CAL annunciator remains on.) To
verify the calibration for the other ranges, press the corresponding range button.
(Pressing a function button begins the offset and gain calibration procedure for that
function.)
6.
Repeat steps 2, 3, and 4 for the remaining functions.
Both two-wire and four-wire ohms functions must be calibrated. (The V ac and mA
ac functions require calibration only if the True RMS AC option is installed.)
•
To calibrate two-wire ohms 100 kΩ and above, use the connection shown in
Figure 4-13A.
•
To calibrate two-wire ohms 10 kΩ and below, use the connection shown in
Figure 4-13B and turn on the calibrator’s two-wire compensation.
•
To calibrate four-wire ohms, use the connection shown in Figure 4-13C, turn off
the calibrator’s two-wire compensation, and press
X so that its indicator is lit.
For the mA ranges, use the connection in Figure 4-13A and set the calibrator’s
current output binding post to AUX before pressing
O.
7.
When all functions have been calibrated, exit the calibration mode by pressing the
8840A CAL ENABLE switch, and attach a calibration certification sticker over the
CAL ENABLE switch. (If the True RMS AC option is installed, instead of attaching
the calibration sticker proceed to the High-Frequency AC Calibration procedure
which follows.)
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