4.5-6 Section 4: Using the Model 9500B — DC/Square Function
Final Width = 215mm
Descriptions assume 9500B/1100
4.5.6.1 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.
4.5.6.2 Interconnections
a. Use the appropriate active head to connect
from the required 9500B channel output to
the input of the UUT Signal Channel to be
calibrated.
b. If a trigger is required, use an active head
(or trigger cable) to connect from the
required 9500B channel output to the input
of the UUT Trigger for the Channel to be
calibrated.
4.5.6.3 UUT Scope — Amplitude
Calibration using the 9500B
as a Fixed Source
The following procedure assumes 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 'Scope
Select the required function for amplitude
calibration.
3. 9500B
Ensure that the 9500B is in Square Function
with Output OFF. If in any other function,
press the
soft key at the top right of the
screen.
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 voltage,
polarity, frequency and load impedance 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 UUT'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 on the UUT
'Scope, record its response at the calibration
point as detailed in the UUT Oscilloscope
Manufacturer's Calibration Guide.
6. 9500B Set Output OFF.
4.5.6 Using the 9500B Square Function to Calibrate the Amplitude
Response of a UUT Oscilloscope
Increasing Output Voltage into High
Voltage State
When increasing output value using any
method; if the new value will be at or greater
than the upper threshold and OUTPUT is OFF,
HV state will be activated but no effect will be
observed. If OUTPUT is ON, it will remain
ON at its latest value. The operator will be
prompted, by audible warning, and error
message: 'Confirm with ON', that HV State is
required. This is done by pressing the OUTPUT
ON key again; then, after a short delay, the
output voltage will be raised to the new voltage
in HV state.
While OUTPUT is ON in HV state, a
distinctive, pulsing tone is emitted. Once in
HV state, OUTPUT can be turned ON and
OFF with no need to confirm.
Decreasing Output Voltage out of High
Voltage State
When decreasing output value using any
method; if the new value will be less than the
lower limit of HV State, then the LV state will
be activated. No warning will be given, except
that the pulsing tone will cease. This rule
applies whether OUTPUT is OFF or ON.
Applicability to Square Function
In Square Function, the output voltage can
only rise above the minimum threshold setting
of 10V, when the expected load setting is
1MΩ. High Voltage State cannot be entered
when the expected load setting is 50Ω.
4.5.5.3 Low Voltage (LV) and High
Voltage (HV) States
(Contd.)
4.5.5 Square Operation (Contd.)
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