High Performance Oscilloscope Calibrator
Front Panel Base Calibration by Functions
109
7.
Set the Standards DMM to the appropriate RMS voltage measurement range.
8.
Calculate the RMS value of the 9500B output pk-pk voltage from the following
factor:
(at 1 kHz, RMS = 0.5 x 0.999917 x pk-pk)
Note
This factor applies only at 1 kHz and assumes use of model 4955 set to
'SQV o/c'. A compensation of 83 ppm accounts the finite transition time of
the Square Wave and the resultant fall in its RMS value.
9.
Press the ON key to turn the 9500B output on.
10.
Press the TAB
Δ
key to return the cursor to the 9500B O/P Amplitude display,
and increment or decrement this value using the cursor controls and/or spinwheel
until the reading on the Standards DMM is the RMS equivalent of the displayed
Target Amplitude pk-pk value calculated in operation (8).
Note
Make sure to allow for any settling time of the external measuring
instrument - approx 30-40 secs.
11.
When you are satisfied with the measurement, press the ACCEPT CALIB key to
generate and implement the correction factor required by the 9500B, to ensure
that its displayed O/P Amplitude value and measured output value coincide. The
O/P Amplitude value will change to the Target Amplitude value, and the
adjustment of the output amplitude at this target is complete.
12.
Press the EXIT key to turn the 9500B output off and return to the Target
Selection screen.
13.
Repeat steps (3) to (12) for each of the target values displayed in the Target
Selection screen.
14.
Repeat steps (2) to (13) for each of the Cal Ranges detailed in the Table 21.
15.
On the Target Selection screen, press the WAVEFORM soft key. Select Square
(negative) by pressing the
key on the right of the screen. Repeat steps
(1) to (14), but using Table 22 for each of the Cal Ranges, Targets and Limits.
16.
On the Target Selection screen, press the WAVEFORM soft key. Select Square
(symmetrical) by pressing the
key on the right of the screen. Repeat steps
(1) to (14), but using Table 23 for each of the Cal Ranges, Targets and Limits.
Note
If other functions are being calibrated in addition to Square Waveform,
refer to Table 18 for information on sequencing calibrations.
