Tektronix 1A5 Instruction Manual page 61

Introduction
The Type 1A5 Differential Amplifier should be
every 500 operating hours or
occurs first. Calibration should
cleaning and inspection as
section.
A calibration record and index
ning of the calibration procedure.
number and gives the name and a brief description of the
adjustment or check performed. Duplicating the calibration
record and index will allow copies of it to be used as a
permanent check-off list and calibration record, leaving the
original as an unmarked reference for rapid location of indivi ­
dual adjustment procedures.
Malfunctions
Correct all malfunctions at the time they are disclosed
by the procedure. Failure to do so will probably affect
other adjustments, requiring that they be done again after
the trouble is finally corrected.
Procedure Format
The equipment setup is given at the beginning of the
calibration procedure. Principal control settings are again
listed at the beginning of each group of adjustments requir ­
ing a substantial change. A picture accompanies each setup.
The step sequence used is designed to allow rapid cali ­
bration with a minimum of setups and interaction. Each step
continues from the equipment status that existed at the end
of the preceding step.
Those steps containing adjustments are identified by the
symbol О appearing on the right margin of the column.
"ADJUST" indicates the point within the numbered steps at
which the actual adjustment is performed. "CHECK" identifies
either a pre-adjustment check or a performance check of a
non-adjustable parameter. "
included when the performance of an adjustment affects
another.
The names of Type 1A5 front-panel controls and internal
adjustments are written in upper-case letters. Oscilloscope
and test equipment controls have the first letter of their
names capitalized. Pictures indicating adjustment locations
and pictures of actual waveforms accompany the procedure.
Waveforms have been offset from reference positions in
many instances to avoid their being hidden by the graticule
lines.
SECTION 6
CALIBRATION
calibrated
every six months, whichever
be preceded by a thorough
explained in the Maintenance
is contained at the begin ­
It refers to each step by
INTERACTION " comments are
Complete Calibration Procedure
Do each step in sequence when performing a complete
calibration procedure. For best results, refine all adjustments,
even though the pre-adjustment check is within allowable
limits. INTERACTION comments can be ignored, since the
procedure logic takes them into consideration.
Partial Calibration Procedure
Any step in the calibration procedure can be
ually. If a pre-adjustment check is within
it is suggested that the adjustment be bypassed
and to avoid unnecessary interaction with
steps. When an adjustment is made, any steps
INTERACTION must be checked.
CALIBRATION EQUIPMENT,
ACCESSORIES AND TOOLS
A Tektronix Type 544 oscilloscope is used
tion procedure. A Type 546, 547 or 556 oscilloscope
substituted, with allowance made for control
Calibration equipment, accessories and
to calibrate the Type 1A5 are listed here
Fig. 6-1, 6-2 and 6-3. Part or type numbers
identification and ordering purposes.
All equipment used must be operating
bration limits. Test equipment substituted for
in this procedure must meet or exceed the
cations stated here.
1. Oscilloscope, Tektronix Type 544.
2. Standard amplitude calibrator.
within 0.25%. Signal amplitude 5 mV to
square wave frequency of 1 kHz. Tektronix
tude Calibrator, Part No. 067-0502-00, recommended.
3. Square wave generator. Frequency 1
High Amplitude output 2 to 5 V into 50 Ω; Fast
variable from 50 mV to 500 mV into 50 Ω, with
or less rise time. Tektronix Type 106 Square Wave
recommended.
4. Constant amplitude sine wave generator.
50 kHz and 1 MHz to 50 MHz. Output amplitude
V. Amplitude accuracy ±3% from 50 kHz to
tronix Type 191 Constant Amplitude Signal
mended.
5. DC non-loading voltmeter. Range 0 to 100
0.02%. Fluke Model 825A used in this procedure.
Type 1A5
done individ ­
allowable limits,
to save time
other adjustment
listed under
in this calibra ­
can be
setttings.
tools necessary
and pictured in
are included for
within its cali ­
that specified
minimum specifi ­
Amplitude accuracy
100 V. Output
Standard Ampli ­
kHz and 10 kHz.
Rise output
1 nanosecond
Generator
Frequency
5 mV to 10
50 MHz. Tek ­
Generator recom ­
V. Accuracy
6-1