Tektronix 7D15 Instruction Manual page 8

Specifications—7D15
TABLE 1-1 (cont)
Characteristics
Performance Requirement
Frequency Ratio
CH B/EXT clock
Range 10-7 to 104
Totalize, CH B:
Range 0 to 108 counts
(Manual ON—OFF control or electrical control from CH A.)
Manual Stop Watch
Range
0 to 10° seconds
NOTE
Formulas given where TB (dec %) is the time base accuracy; P;,, is the period or time interval of the unknown
signal (whichever is applicable); M is the number of averages taken; Px is the measurement clock period; T is the
gate time; Fin is the frequency of the unknownsignal; Enpk is equal to the peak noise amplitude at the input to
the counter gate circuit; dv/dt is the signal slope at the input to the gate; K is equal to 2Enpk/ dv/dt.
Characteristics Performance Requirements Supplemental Information
INPUT SIGNALS CHA &B
Frequency Range (CH only)
DC Coupled DC to 225 megahertz
AC Coupled 5 hertz to 225 megahertz
Sensitivity
CH A & B Inputs
TRIG SOURCE
100 millivolts peak-to-peak
Vertical deflection of:
0.5 divisions to 100 MHz
1.0 divisions to 225 MHz
or to the vertical system bandwidth,
whichever is less.
Input Resistance and
Capacitance
Approximately 1 megohm, 22 picofarads
Minimum Pulse Width
5 nanoseconds
Minimum gate "OFF" time
Between Samples During
TIM Averaging Operation
10 nanoseconds
Maximum Input Voltage
200 volts DC linearly derated to 20 volts
at 200 megahertz
E max = 20 + 180 (1 — Fj,(MHz)/200
1-2
REV. A, SEPT. 1977