Welch Allyn Grason-Stadler GSI 17 Series - Attenuator Circuit Test Check

L Use
the
following table to check various circuit
voltages
for
proper level.
Table 6-l:
ATTENUATOR CIRCUIT TEST CHECK
NOTE: Voltage measurements with DAC value of 0, 1 kHz Frequency
and Tone Steady.
Measurement Location
Expected Voltaqe
Junction R314 & R316 (R Side) - Osc. out
.2 VRMS
U3033 Pin 15
- DACVoltageReference
3.35Vdc
Tone OFF
U3033Pins 4
thru 11
+55 Vdc
0 Vdc
U3022Pin 7
-3.4 Vdc
0 Vdc
U3000Pin 7
+ .5 Vdc
-.155Vdc
U3000Pin 1
0
VRMS
1.2 VRMS
Junction R313 & R311 (R Side) -3.4 Vdc
0 Vdc
10 dB Range Extender Check
Pad OUT
Pad In
U3000Pin 1
DAC = 0
1.2 VRMS
* 3.5 VRMS
DAC = 10
.7 VRMS
2.1 VRMS
* Sine Wave should have "clipping" evident on negative and
positive slopes.
Increasing DAC value to 5, 6, or 7 should
decrease output level and eliminate clipping.
51