Peak, -Peak, Peak-To-Peak Volts Accuracy; Accuracy; Gated Volts Accuracy; Gated Volts A C C U Ra C Y - Tektronix 2246 1Y Service Manual

Performance Check Procedure—2246 1Y and 2246 Mod A Service

3. +Peak, -Peak, Peak-to-Peak Volts Accuracy

a. Set:
Vertical MODE
CH 2 VOLTS/DIV
CH 2 Input COUPLING
CH1/CH2 VOLTMETER
b. Set the calibration generator (PG 506) internal
Square Wave/DC Switch for a square-wave out­
put signal.
NOTE
It is necessary to remove the PG 506
from the TM power supply module to set
the internal Square Wave/DC switch to
square-wave output. Turn the power off
before removing or inserting any plug-in
from the TM power supply
c. Connect calibration generator Std Ampl output
to the CH 2 input via a 5 0 - fl precision BNC
coaxial cable.
d. Set calibration generator for Std Ampl output of
50 mV do.
e. CHECK—that the readout is between 47.0 mV
and 53.0 mV.
f. Set SCOPE BW on.
g. CHECK—the readout is between 47.7 mV and
52.3 mV.
h. Set:
CH 2 INVERT
CH1/CH2 VOLTMETER
i. CHECK—the readout is between -4 7 .7 mV and
-52.3 mV.
j. Set SCOPE BW Off.
k. CHECK—the readout is between -4 7 .0 mV and
-5 3 .0 mV.
. Set:
l
CH1/CH2 VOLTMETER
CH 2 INVERT
m. CHECK—the readout is between 46.5 mV and
53.5 mV.
n. Disconnect calibration generator.
4-26
4. 25 MHz +Peak, - Peak, and Peak-to-Peak Volts

Accuracy

a. Connect leveled sine-wave generator (SG 503)
CH 2 (CH 1 off) output to the CH 2 input via a 50-.Q BNC coaxial
cable and a 50-.Q BNC termination.
10 mV
DC
b. Set CH 2 VOLTS/DIV to 20 mV.
+PEAK
c. Set leveled sine-wave generator output for a
readout of 100.0 mV +0.5 mV at 50 kHz.
d. Set leveled sine-wave generator output for
25 MHz.
e. CHECK—the readout is between 95.0 mV and
105.0 mV.
f. Set CHI/CH2 VOLTMETER to -PEAK.
g. CHECK—the readout is between -4 6 .0 mV and
-5 4 .0 mV.
h. Set CH1/CH2 VOLTMETER to +PEAK.
i. CHECK—the readout is between 46.0 mV and
54.0 mV.
5. 100 MHz+Peak, -Peak, and Peak-to-Peak Volts
Accuracy
a. Set leveled sine wave generator (SG 503) output
frequency to 100 MHz.
b. CHECK—the readout is between 34.4 mV and
54.0 mV.
c. Set CHI/CH2 VOLTMETER to -PEAK.
On d. CHECK—the readout is between -3 4 .4 mV and
-5 4 .0 mV.
-PEAK.
e. Set CH1/CH2 VOLTMETER to PK-PK.
f. CHECK—the readout is between 69.7 mV and
107.0 mV.
g. Disconnect the leveled sine-wave signal from
the 2246 1Y or 2246 Mod A.

6. Gated Volts Accuracy

PK-PK
a. Set:
Off
A SEC/DIV
CH 2 VOLTS/DIV
b. Set CH1/CH2 VOLTMETER to GATED +PEAK.
0.5 ms
10 mV