Tektronix 1A5 Instruction Manual page 54

Performance Check — Type 1A5
2. Check Differential Probe Relay Operation
REQUIREMENT — PUSH ON/OFF button controls Differ ­
ential Probe Relay.
a. CHECK — Depress PUSH ON/OFF button. Observe that
the Probe On lamp illuminates.
b. Depress PUSH ON/OFF button, returning Probe On
lamp to " Off" state.
3. Check Vertical Balance
REQUIREMENT — No trace shift accompanies VOLTS/CM
switching or rotation of VARIABLE gain.
a. Using the POSITION control, set trace to graticule
center.
b. CHECK — Switch VOLTS/CM to 1 mV. Trace should re ­
main at graticule center.
c. ADJUST — STEP ATTEN BAL to return trace to graticule
center.
d. Switch back to 20 mV and repeat steps a, b, and c un ­
til no further adjustment is necessary.
e. Switch VOLTS/CM control to 20 mV.
f. CHECK — UNCAL lamp lights when VARIABLE is moved
from CAL position.
g. CHECK — No trace shift occurs as VARIABLE knob is
rotated.
h. ADJUST — VAR BAL until no trace shift accompanies
rotation of VARIABLE knob.
i. Return VARIABLE to CAL position.
4. Check Gain
REQUIREMENT — Gain within 2% of standard.
a. Connect a flexible T connector to the A and В INPUT
connectors.
b. Connect a 0.1 V - 1 kHz square wave output from the
Standard Amplitude Calibrator to the center of the flexible
T connector, using a coaxial cable equipped with BNC con ­
nectors.
c. Switch the A Input AC-GND-DC control to DC. Adjust
POSITION control to center the display.
d. Adjust oscilloscope Triggering Level to obtain an un ­
triggered sweep.
e. CHECK — 5 cm ± 1 mm display amplitude, allowing for
trace width.
f. ADJUST — GAIN for exactly 5 cm display amplitude.
g. CHECK — A INPUT gain under setups given in Table
5-1.
5-2
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TABLE 5-1
Type 1A5 Standard Amplitude
Calibrator
VOLTS/CM
Setting Amplitude Setting
1 mV 5 mV
2 mV 10 mV
5 mV 20 mV
10 mV
50 mV
10 mV Retained 50 mV
Range
20 mV Retained .1 V
Range
20 mV .1 V
50 mV . 2 V
. 5 V
.1 V
.1 V Retained .5 V
Range
.2 V Retained 1 V
Range
. 2 V 1 V
. 5 V 2 V
1 V 5 V
10 V
2 V
5 V 20 V
10 V 50 V
20 V 100 V
h. Switch A Input AC-GND-DC control to
В Input AC-GND-DC control to DC.
trol to center the display.
i. CHECK — В Input gain by repeating the setups
in Table 5-1, progressing from bottom to top.
5. Check VARIABLE Control
REQUIREMENT — VARIABLE control range of 2.5:1 or great ­
er.
a. Rotate VARIABLE fully counterclockwise.
b. CHECK — Display amplitude is 2 cm or less.
c. Return VARIABLE to CAL position.
d. Use of the Standard Amplitude Calibrator has been
completed. Disconnect the coaxial cable from the flexible
T connector.
6. Check Comparison Voltage (Vc) Accuracy
REQUIREMENT — 1 mV /СМ to 2 V/CM:
of indicated voltage, whichever is greater;
V/CM: ±1 mV or ±1% of indicated voltage,
is greater.
a. Switch DISPLAY to A-Vc.
b. Connect a non-loading voltmeter to
banana jack.
c. Rotate Vc AMPLITUDE control fully
Display
Amplitude
5 cm ± 1 mm
5 cm ± 1 mm
4 cm ± 0.8 mm
5 cm ± 1 mm
5 cm ± 1.25 mm
5 cm ± 1.25 mm
5 cm ± 1 mm
4 cm ± 1 mm
5 cm ± 1.25 mm
5 cm ± 1.25 mm
5 cm ± 1.25 mm
5 cm ± 1.25 mm
4 cm ± 1 mm
5 cm ± 1.25 mm
5 cm ± 1.25 mm
4 cm ± 1 mm
5 cm ± 1.25 mm
5 cm ± 1.25 mm
GND and the
Use POSITION con ­
given
Range
±5 mV or 0.5%
5 V/CM to 20
whichever
the MONITOR
counterclockwise.