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Page 68 of 97
Issue: 1.04
CAL:OFFS1
offset1
CAL:OFFS2
offset2
CAL:OFFS3
offset3
Where
offsetX
is the zero offset measured for channel X. The value entered for
each channel can be read back using
CAL:OFFS
X
?
(for channel
X
). Re-check the
zero offsets for all three channels (see section 7.1.3.1).
7.2.8 Calibrating Voltage Span
Connect a stable, low noise voltage source with a nominal value of 50mV to
channel 1 of the microK using low thermal EMF wire and connectors (copper or
an alloy such as tellurium–copper that has a high copper content and low thermal
EMF to pure copper. Brass connectors must NOT be used):
V
I
Voltage
Source
Configure the microK to measure a Default Thermocouple on the 0.125V range
with units of Volts. Use 1 sample per reading and 100 readings in the rolling
statistics (see section 3.6). Select the
Single
tab and clear the statistics. After the
microK has collected at least 100 readings (shown as
Mean of last…
in the
Single
tab, record the
Mean
value and check that the standard deviation (
S.D.
) is
less than 0.000000050V (0.05µV).
Calculate the require gain from:
value
measured
value
actual
gain
=
Now apply the new gain by typing the command:
CAL:GAIN X40,POS,
gain
