Tektronix 1S1 Instruction Manual page 114

TABLE 5-1
1-2-5-Ratio Check
Type 1S1 Time-Mark
TIME/CM Generator
.5 µSEC
.2 µSEC
.1 µSEC
X10 and X100 Attenuators
k. Set the Type 1S1 TIME/CM switch to 5µSEC.
l. Check the timing (XI) as indicated in Table 5-2 at
5µSEC, then pull out on the MAGNIFIER knob and turn
the TIME/CM switch as indicated in the table.
m. Check timing when using the X10 and X100 magni-
fiers as given in Table 5-2 and illustrated in Fig. 5-55.
Timing over the center 8cm should be within 1% (0.08cm)
at each magnification.
TABLE 5-2
Magnifier Check
TIME
POSI-
Magnifi- TYPE 1S1
TION
cation TIME/CM
RANGE
X1 50µS 5 µSEC
X10 50µS .5 µSEC
X100 50µS 50 nSEC
Fast Ramp Timing
n. Set the Type 1S1 TIME/CM switch to each position
given in Table 5-3 and apply the indicated timing signal.
o. Check timing on each time position range as indicat-
ed in the table and in Fig. 5-56. Timing over the center
8 cm should be within 1 % on each range.
(1)
TIME
POSITION
RANGE
500 µS
50 µS
5 µS
500 nS
50 nS
*Use 5-µsec markers and move 5th marker to 10cm to the left, then check timing.
Display
5 Mc 5 cycles / 2 cm
5 Mc 1 cycle / cm
5 Mc 1 cycle / 2 cm
Time-
Mark
Gener-
Display
ator
5 µSEC 1 marker/cm
1 µSEC 1 marker/2 cm
10 Mc 1 cycle /2 cm
Ramp Linearity Check
(2)
TIME/CM
(Magnified)
2 µSEC
.2 µSEC
20 nSEC
1 nSEC
.5nSEC
Type 1S1
TIME/CM
50 µSEC
5 µSEC
.5 µSEC
50 nSEC
5 nSEC
Fast Ramp Linearity
For each fast ramp (time position range), check linearity
as follows:
1. Set the TIME POSITION RANGE switch to the posi-
tion indicated in column 1 of Table 5-4.
2. Pull out on the MAGNIFIER knob and turn the TIME/
CM switch to the position indicated in column 2.
3. Turn the TIME POSITION and FINE controls fully
counterclockwise and check timing with the signal indicat-
ed in column 3. Timing should be within 3% (±0.24cm
over 8 cm).
4. Turn the TIME POSITION and FINE controls fully
clockwise, then adjust the FINE control to remove the num-
ber of cycles indicated in column 5, and check the timing
again. (The FINE control adjustment eliminates a specified
amount of non-linearity at the start of the ramp.) Timing should
be within 3%
be within 1% (±.08cm) of the measurement made with
the controls turned counterclockwise.
Optional Timing Checks
The preceding steps have checked all sweep rates to with-
in 3% accuracy; however, not all positions of the TIME/CM
switch were included in the checks, since this was not neces-
sary. If desired, all positions of the switch may be checked
TABLE 5-4
(3)
Timing
Signal
1 µSEC marker
5 Mc sine wave
50 Mc sine wave
1 Gc sine wave
1 Gc sine wave
Calibration – Type 1S1
TABLE 5-3
Fast Ramp Timing
Time-Mark
Generator
50 µSEC
5 µSEC
1 µSEC
10 Mc
50 Mc
(±0.24cm over 8cm),
(4)
Display
Clockwise
2 markers/cm
1 cycle/cm 10 cycles (2 µsec)
1 cycle/cm 10 cycles (0.2 µsec)
1 cycle/cm 20 cycles (20 nsec)
1 cycle/2 cm 4 cycles (4 nsec)
Display
1 marker / cm
1 marker / cm
1 marker / 2 cm
1 cycle / 2 cm
1 cycle / 4 cm
and should
(5)
Delete at
Position
20 µsec*
5-51