Tektronix 190 Calibration Procedure

FACTORY CALIBRATION PROCEDURE
Unabridged factory calibration procedure
Miscellaneous calibration information
guide in calibrating brand-new instruments, just
assembled instruments that have never been turned
on before. Therefore it calls out many procedures
INTRODUCTION:
This isn't a field recalibration procedure as is the 0 :
procedure in your instruction manual, This is a ) 5
and adjustments that are rarely required for sub-
sequent recalibration, Publication: KN
Even though we wrote this procedure primarily for September 1962
our own factory test department, it's valuable to |
others also if used with some caution: 6:
1, Special test equipment, if mentioned, is not
available from Tektronix unless it's listed also in For 190, 190A and 190B,
our current catalog, This special equipment is used all serial numbers.
in our test department to speedcalibration. Usually
you can either duplicate its function with standard
equipment in your facility, devise alternate ap-
proaches, or build the special test equipment your-
2. Factory circuit specifications are not guaranteed unless they also appear as catalog
or instruction manual specifications. Factory circuit specs usually are tighter than adver-
tised specs. This helps insure the instrument will meet or exceed advertised specs after
shipment and during subsequent field recalibrations over several years of use. Your
instrument may not meet factory circuit specs but should meet catalog or instruction
manual specs.
3. Presetting internal adjustments, if mentioned, usually is unnecessary. This is help-
ful for "first-time" calibration only, If internal adjustments are preset, you'll have to
perform a 100% recalibration. So don't preset them unless you're certain a "start-from-
scratch" policy is the best.
4. Quality control men steps. Factory calibration procedures are for our test depart-
ment calibrators who first calibrate the instrument. Quality control men then check the
initial calibration and perform additional fine points such as trimming resistor leads,
installing shields, etc. In some cases a factory calibration procedure instructs the cali-
brator not to perform these fine points, You'll ordinarily have to include these fine
points in your calibration.
In this procedure, all front panel controls for the instrument under test are in capital
letters (SENSITIVITY) and internal adjustments are capitalized only (Gain Adj).
& 190 FCP 9-22-62 190 CALIBRATION C-91