NF HSA42011, Instruction Manual

Page: 26 / 86

2.4 Simplified Operation Check
HSA42011 2-8
 Operation
If the product generates smoke, smell, or sound, disconnect the power cord from the outlet
immediately, and leave a notice that the product must not be used until the product is repaired.
1. Turn on the power switch.
All LEDs above the switches, the 0% LED of output meter LEDs, the overload LED (OVLD), and
the error LED (ERR) turn on. After all LEDs above the switches turn off and the error LED (ERR)
blink for a few seconds, the overload LED (OVLD) and the error LED (ERR) turn off. Next, when
the internal power supply is fixed, the state selected at power-on time is set.
If the gain setting is not

50, change the setting.
2. Check that the output LED meter indicates 0 %.
3. Set the frequency of the signal generator to 1 kHz, the waveform to sine wave, and the voltmeter
for AC measurement.
4. Increase the level gradually from 0 V, and set this product input voltage to 1 Vrms (check the input
voltage with the voltmeter). At this time, check that the output LED meter indication changes from
0 V to 50 V. (Indication level from 0% to 100% with 75 V as 100%)
5. Press the output ON/OFF switch then check, with the oscilloscope and voltmeter, that about 50
Vrms is output on the output connector (OUTPUT). At the same time, check that the waveform
does not have any distortion, such as clipping.
6. Switch the gain setting then check the output level.
GAIN Output Level

20 20 Vrms
 10
10 Vrms

1 1 Vrms
7. Set the level of the signal generator to 0 V, set the bias of this product to ON, and set the voltmeter
for DC measurement. Next, by tuning the bias dial, check the output LED meter indication and
output voltage.
Bias dial 0.71 2.00 5.00 8.00 9.29
Output
Approx.

75 V
Approx.

53 V
Approx.
0 V
Approx.
+53 V
Approx.
+75 V
Meter indication
Approx.

75 V
Approx.

53 V
Approx.
0 V
Approx.
+53 V
Approx.
+75 V
！
WARNING