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3) Turn the LO-CONTOUR to V (maximum). You should read +11dBu
(2.85Vrms) on DVM #1 (+/- I.OdBu).
Detector Check:
1) Input a 5000Hz signal O.OdBu (0.775Vrms) into the input.
2) With DVM #2 (set to DC volts) measure TPA [TPBI- The meter should read
+0.490Vdc (+M0mVdc).
3) Input a 500Hz signal O.OOdBu (o.775Vrms) into the input. DVM #2 should
read +0.190 (+/- SOmVdc).
Manual Process Switch Test:
1) Switch the PROCESS switch to MANUAL.
2) Input a 5000Hz signal (OdBu) into the input.
3) With the DEFINITION control to MAXIMUM using the DVM #1 measure TPA
[TPB].
4) The DVM should read 0.400VDC (+/- 0.030VDC).
5) Measure the output with DVM #2. It should read +6dBu {+/-1dBu).
6) Return the DEFINITION control to MINIMUM.
Clip Indicator Adjustment:
1) Input a 500Hz signal into the input with an amplitude of 7.75Vrms(+20dBu).
2) Adjust VR1A [VR1B] until the CLIP indicator just turns on. If the LED is
already on adjust VR1A [VR1B] until the LED goes out and then bring it back
up until it just turns on. (+19dBu should turn it off {6.90Vrms})
XLR Balanced/Unbalanced Test:
1) With a balanced connection, insure that the unit functions normally as
described above.
2) With an unbalanced connection, insure that the unit functions normally as
described above.
Bypass Check:
1) Turn the definition completely counterclockwise until the process "clicks" off.
2) Since the model 702 has "hard wire" bypass, whatever is present at the input
of the device should be present at the output when in bypass mode. Verify
that this is so.
DC Voltage at Output Test:
1) Measure the output XLR connectors, both pins 2 and 3, with the DVM set to
DCvolts the voltage must be O.OOVdc.
LED Test:
1) Input a 5000Hz signal ((5)0dBu) into the connector marked CHANNEL A [B]
INPUT The green (+) LED should light.
2) Input a 500Hz signal (@0dBu) in the connector marked CHANNEL A [B]
INPUT. The red (-) LED should light.
3) Disconnect the signal input and the amber (0) LED should light.
4) With the FUNCTION turned to the ON position the corresponding green LED
should be lit.
5) With the FUNCTION turned to the OUT position, the corresponding green
LED should turn off.
Offset Drift Test:
1) With no signal present at the input(open) measure TPA [TPB] with
the DVM set to DC volts.
2) Insure this voltage is O.OOVdc (+/-0.25mVdc)
THIS COMPLETES THE CALIBRATION OF THE BBE® MODEL 702
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