B&K
700-707
Calibration
Calibration Steps:
Make sure the
“Circuit Transfer” button on the front panel is in the UP position before starting.
Be sure to use insulated screwdrivers during adjustment and pay attention to hand placement when the tester is out of its
case. Electrocution or death is VERY possible if you are not careful! NEVER touch the underside of the tester with both
hands while the unit is plugged in
– EVER. Do not touch resistor metal leads while testing – EVER.
Step 1 / Shorts Adjustment:
Insert the gold pins of the provided 1 meg resistor into socket 1 / pins 2 and 4. With the shorts button depressed, Adjust R1 6
until the shorts lamp just barely illuminates. Once the 1 meg resistor is removed and the shorts button is pressed again, the
light should not come on.
Step 2 / Grid Emissions Sensitivity Adjustment:
Insert the gold pins of the provided 20meg resistor into socket 1 / pins 1 and 7. Adjust R17 with the grid emissions button
depressed so that the meter reads 20.
Step 3 / Signal Voltage Adjustment:
You will need a DMM or DVOM for this step. Set your meter to autorange AC.Insert the gold pin of the 1uF capacitor into
socket 1 / pin 1. Then, insert the gold pin of the metal hoop carefully into socket 1 / pin 2 (this is a very tight fit). Pre ss and
hold test button 1 and adjust R20 to dial in 1.5V AC on your DMM or DVOM.
Step 4 / DC Bias Adjustment:
You will need a DMM or DVOM for this step. Set your meter to autorange DC. Connect your DMM or DVOM via clips to the
backside of socket 1 / pin 1 and 2. Pay attention to which pin is which when looking at the tester from the back side! Press
and hold test button 1 and adjust R11 to -2.5V DC.
Step 5 / Bridge Balance Adjustment:
Prior to adjusting balance, make sure your meter has been mechanically zeroed. With the tester at rest, meter facing up,
adjust the small flat plastic screw at the base of the meters needle so that the meter rests exactly at 0. Next, insert the g old
pins of the provided 10K resistor into socket 1 / pins 2 and 5. Set sensitivity control to maximum / 100. Press and hold test
button 1 and adjust R5 until the meter reads zero electrically.
Recommended or Required to have available:
- Magnifying glass (recommended but not required)
- Thick Rubber Gloves can help prevent electrocution (recommended but not required)
- Digital Multi Meter (DMM or DVOM)
- #2 Phillips screwdriver (insulated)
- Full set of calibration resistors & capacitor
- A quality digital multimeter with spring loaded IC hook leads
7
6
5
4
3
2
1
7
6
5
4
3
2
1
SENSITIVITY POT
R5 BRIDGE BALANCE
R16 / SHORTS /
SOCKET 30
R17
GRID EMISSIONS
SOCKET 33
R20
SIGNAL VOLTAGE
SOCKET 25
R11 DC BIAS
SENSITIVITY POT
R5 BRIDGE BALANCE
R16 / SHORTS /
SOCKET 30
R17
GRID EMISSIONS
SOCKET 33
R20
SIGNAL VOLTAGE
SOCKET 25
R11 DC BIAS
SOCKET 1 PINOUT
(TOP VIEW)
