GENERAL RADIO COMPANY 1398-A Operating Instructions Manual page 4

SPECIFICATIONS
PULSE REPETITION FREQUENCY
Internally Generated:
2.5 c/s to 1.2 Mc/s, with calibrated points
in a 1-3 sequence from 10 c/s to 300 kc/s, and 1.2 Mc/s, all
+
5%.
Continuous coverage with an uncalibrated control.
Externally Controlled:
Aperiodic, dc to 2.4 Mc/s with 1-V, rms,
input (0.5 V a t 1 Mc/s and lower); input impedance a t 0.5 V,
rms, approximately 100 kD shunted by 50 pF. Output pulse is
started by negative-going input transition.
OUTPUT-PULSE CHARACTERISTICS
Duralion:
100 ns to 1 s in 7 decade ranges, +5y0 of reading or
+2y0 of full scale or
+
35 ns, whichever is greater.
\\
Rise and Fall Times:
Less than 5 ns into 50 or 100 0; typically
60 ns
+
2 ns/pF external load capacitance into 1 kD (60 V).
Voltage:
Positive and negative 60-mA current pulses available
simultaneously. Dc coupled, dc component negative with respect
to ground. 60 V, peak, into 1-kD internal load impedance for
both negative and positive pulses. Output control has 10 steps
plus continuous adjustment.
Overshoot:
Overshoot and noise in pulse, less than 10yo of ampli-
tude with correct termination.
Ramp-off:
Less than 1
%.
Synchronizing Pulses:
Prepulse:
Positive and negative 8-V, approx, pulses of 150-ns
duration. I f positive sync terminals are shorted. negative pulse
can be increased to approximately 50
V.
Sy nc-pulse source impedance:
positive - approx 300 D;
negative - approx 1 kD.
Delay-Sync Pulse:
Consists of a negative-going transition of
approximately 5 V and 100-ns duration, coincident with the late
edge of the main pulse. Duration control reads time between
prepulse and delayed sync pulse. This negative transition is imme-
diately followed by a positive transition of approximately 5 V
and 150 ns to reset the input circuits of a following pulse generator.
(See oscillogram.)
Stability:
With external-drive terminals short-circuited, prf jitter
and pulse-duration jitter are each 0 . 0 4 ~ 0 . (Jitter figures may vary
somewhat with range switch settings, magnetic fields, etc.)
Power Required:
105 to 125, 195 to 235, or 210 to 250 V, 50 to
60 c/s, 90 W.
Accessories Available:
TYPE 1217-P2 Single-Pulse Trigger, rack-
adaptor panel.
MECHANICAL DATA
Convertible-Bench Cabinet.
Net
Weight
lb
kg
14Yz
1
7.0
Depth
i n mm
8%
1
210
Width
i n mm
12
1
305
Shipping
Weight
lb
kg
18
1
8.5
Height
i n mm
5%
1
135