IM CA71-E
10-5
Method of Calibrator Adjustment
10
TIP
With the CAL mode selected, press the
key while holding down the
key. This
key operation cancels the CAL mode (the same key operation as for selecting the
CAL mode). You can use the same key operation to cancel the CAL mode during
adjustment, before saving to memory.
CAUTION
– Precautions when adjusting the 400
Ω
range for resistance signal source
(1) Internal Offset Adjustment
When setting a resistance of 0.00
Ω
, make sure the voltage between the H
and L terminals is within
±
20
µ
V. If the voltage is beyond the limits, internal
adjustments must be made. Contact the vender from which you purchased
the instrument.
(2) Notes on Resistance-measuring Current
Adjusting the 400
Ω
range requires drawing two types of resistance-mea-
suring current – 1 mA and 5 mA – from an external device. Adjust the
range separately for each of these currents.
Adjustment for 1 mA
This adjustment is possible with the resistance measuring range of
the calibration standard (digital multimeter). At this point, make sure
the resistance-measuring current is 1 mA.
Adjustment for 5 mA
Like the method of adjusting the 400
Ω
/5 mA range shown in the fig-
ure (Hook-ups for Adjustment) on page 10-3, you can make this ad-
justment by applying the reference current of 5 mA from the external
device and then measuring the resulting voltage drop.
10.2 Adjusting source Functions
