Tektronix 1A5 Instruction Manual page 27

Fig. 2-14. Adjusting the P6023 Probe.
BRATION of second probe to that of first probe; (D) Matching AC COMP of second probe to that of first probe.
and (C ) — .5 ms/cm; (D) — .2ms/cm; vertical sensitivity; 20 mV/cm.
l. Switch the В Input AC-GND-DC controls to DC. Switch
the Amplitude Calibrator to 20 V and adjust the Type 1A5
POSITION control as necessary to center the display.
m. Adjust the DC ATTEN CALIBRATION of the second
probe until the trailing edges of the square waves are all
at the same vertical display amplitude, as shown in Fig.
2-14 (C).
n. Switch the oscilloscope Time/cm to
o. Adjust the AC COMP FINE ADJUST (and AC COARSE
COMP if necessary) of the second probe to obtain optimum
flatness and minimum aberration at the leading edges of the
square waves, as shown in Fig. 2-14 (D).
p. Switch the Amplitude Calibrator to Off and the Type
1A5 A and В Input AC-GND-DC controls to GND.
probes are now adjusted for use with the Type 1A5, and
matched to each other.
Prior to probe use in critical common-mode applications,
connect both probe tips to one of the two points to be com ­
pared. Set the Type 1A5 VOLTS /СМ control to the sen ­
sitivity setting which will be used in the actual application.
Readjust the second probe to provide maximum CMRR as ob ­
served on the CRT.
Examples of Voltage/Signal Measurements
The rest of this section provides examples of how to make
various voltage/waveform measurements. All examples pre ­
(A) Adjusting DC ATTEN CALIBRATION; (B ) Adjusting AC COMP; (C) Matching DC ATTEN CALI-
.2 ms.
The
Operating Instructions — Type 1A5
sume that the Type 1A5 front panel adjustments have been
made satisfactorily. Reasons
are not covered here, but can be understood if the operator
has read the information contained earlier in this section.
These examples can be duplicated by an operator to serve
as familiarization exercises.
NOTE
In all cases the Vc AMPLITUDE
VOLTS /СМ switch were set on the basis
age input whose approximate value
If the approximate value of voltage is
(but is definitely within the maximum
range of the Type 1A5), it can be
single ended or differential comparator
starting with the least sensitive
ting (20 V/CM).
Type 544 Oscilloscope set-up for all examples:
Triggering Mode
Triggering Slope
Triggering Coupling
Triggering Source
Time/CM
Horizontal Display
Amplitude Calibrator
Example 1. Single-ended operation, DC
Measure the voltage output of a 1.5 V
Sweep rate: (A), (B)
for the steps or their sequence
control and the
of a volt ­
was known.
not known,
input signal
determined by
methods,
VOLTS /СМ set ­
Auto
+
AC
Norm Int
2 ms
Normal ( ×1
50 mV
measurement.
battery. (Any con ­
2-19