Fluke 9500B - Using the 9500 B Current (Square) Function to Calibrate the Pulse Response of a UUT Oscilloscope Current Probe

4.10-4 Section 4: Using the Model 9500B — Current Function
Final Width = 215mm
Descriptions assume 9500B/1100
Deviation (Scope and Direct Mode)
The triangular type of cursor indicates that all
the cursor keys can be used.
From the default 00.00%, the deviation
percentage can be changed to any value within
its resolution between -11.20% and +11.20%,
providing that the other contributors do not
take the output current value out of its limits.
The result of combining the units/division,
multiplier and deviation are shown as the value
of 'O/P Amplitude p-p'.
Output Current (Scope and Direct Mode)
The O/P Amplitude is only adjustable by means
of its contributors.
From the default 4.0000mA p-p, the output
current can be changed to any value within its
resolution from 88,8µA p-p to 111.2mA p-p.
Frequency (Scope and Direct Mode)
From the default 1kHz, the output frequency
can be changed to any value within its resolution
between 10Hz and 100kHz.
4.10.7.1 Introduction
Two types of procedures for amplitude
calibration are given:
a. Using the 9500B as a fixed source, where
the oscilloscope can be adjusted;
b. Using the 9500B as an adjustable source,
reading oscilloscope deviations via the
9500B screen.
4.10.7.2 Interconnections
a. Use the appropriate active head and current
probe accessory to connect from the
required 9500B signal output channel to
the UUT current probe.
b. If a trigger is required, use the appropriate
active head (or trigger cable) to connect
from the required 9500B channel output to
the scope input.
4.10.7.3 Common Setup
The following procedures assume that the
9500B instrument is in Manual Mode. It is also
assumed that the user will be familiar with the
methods of editing screen values. In the case
of difficulty, re-read the paragraphs earlier in
this Section 4.
9500B and UUT Oscilloscope Setup
1. Preparation
Ensure that both instruments are powered ON
and warmed up.
2. UUT Probe
Select the required function for probe pulse
response calibration.
3. 9500B
Ensure that the 9500B is in Current Function
with Output OFF. If in any other function,
press the 'Aux' key on the right of the
'OSCILLOSCOPE CALIBRATOR' panel,
then the
soft key on the top right of
the screen.
4.10.7.4
UUT Current Probe — Pulse Response
Calibration using the 9500B as a Fixed
Source
Sequence of Operations
Refer to the table or list of UUT Oscilloscope
amplitude calibration points in the UUT
Oscilloscope Manufacturer's Calibration
Guide.
Follow the sequence of calibration stages as
directed by the guide, and carry out the
following operations (1) to (6) at each stage.
1. 9500B
Use the front panel controls to set the 9500B
Output to the required square wave p-p current
and frequency for the UUT 'Scope amplitude
cal point:
2. UUT 'Scope
a. Select the correct channel for the cal point.
b. Select the correct range for the cal point.
3. 9500B Set Output ON.
4. UUT 'Scope
a. Adjust the sweep speed and trigger level
for a stable display.
b. Observe and note the amplitude response.
5. Calibration
a. If a calibration adjustment is provided,
adjust the probe's response to be appropriate
to the settings on the 9500B screen, as
detailed in the UUT Oscilloscope
Manufacturer's Calibration Guide.
b. If no adjustment is provided , record the
probe's response at the calibration point as
detailed in the UUT Oscilloscope
Manufacturer's Calibration Guide.
6. 9500B Set Output OFF.
4.10.6 Square Operation (Contd.) 4.10.7 Using the 9500B Current (Square) Function to Calibrate the
Pulse Response of a UUT Oscilloscope Current Probe
4.10.6.2 Output Current Editing (Contd.)