Outputs Calibration Procedure - Quantum Data 606 Quick Start Manual

Options Menu - Output Calibration
All Model 606, 607 and 608 video test generators use programmable hardware to set all of the ampli-
tude calibration factors analog video outputs. These calibration factors are stored in Flash EPROM and
are not lost if the batteries are run down or removed. Firmware updates will not affect these factors in
most cases. A hardware jumper inside the unit enables user modification of the settings.
All generators leave our factory with the analog video and sync output amplitudes calibrated to pub-
lished specifications. You can recalibrate these amplitudes over a nominal range to meet your specific
testing conditions.
WARNING: There is no way to recall any of the original factory calibration settings once
you have saved any of your own settings. Saving your calibration settings or resetting
to nominal overwrites all previously saved factory or user settings.
Equipment needed
DC voltmeter capable of measuring from 0 to 1 volt with a minimum resolution of 2 millivolts
Precision 75 ohm (+/- 1%) input terminator for the meter
Test cable to connect the voltmeter to the R, G, B and Ground pins on the VGA connector.
Additional Equipment for Model 608 NTSC Output Re-calibration:
Oscilloscope with a precision 75 ohm (+/- 1%) input impedance and suitable gain and bandwidth to
display a 1.00 Volt pk-pk signal with 3.579 MHz color carrier
One 75 ohm coaxial cable to connect the oscilloscope to the BNC TV output.
Enabling user re-calibration
All generators leave our factory with an internal hardware jumper set to disable user modification of the
calibration settings. You can check the current jumper setting by turning on the generator and pressing
the OPTIONS button. If "Calibrate" is one of the menu choices, the jumper is set to enable re-calibra-
tion. The following steps describe changing the jumper setting if the menu choice does not appear.
1) Turn off the generator and follow the directions on page 2 for remov-
ing the back cover.
2) Locate J5 as shown in the figure on the right.
3) The generator leaves our factory with a removable shorting jumper
on pin 1 or pin 2. You will need to provide a suitable shorting jumper
to enable user calibration if the original jumper is missing.
4) Place the jumper so it connects pin 1 to pin 2. Placing the jumper so
that it only connects to pin 1 or pin 2 will disable user calibration.
5) You can replace the back cover but do not need to screw it down if you intend to reset the jumper
after performing the re-calibration. You can replace the screws if you intend to leave the jumper as
is. The re-calibration procedure does not require access to any test points inside the case.
Page 8 Model 606, 607, 608, 609 Quick Start Guide
J5
Pin #1
U22