Tektronix DC501
|
basic 100 MHz frequency counter
Produced from 1972 to 1980
Manuals
- (All manuals in PDF format unless noted otherwise)
|
The Tektronix DC501 is a basic 100 MHz frequency counter plug-in for the TM500 system.
Key Specifications
Input frequency
|
10 Hz to 100 MHz
|
Gate time
|
10 ms to 10 s in decade steps, plus Manual (totalize count of up to 107 events)
|
Resolution
|
7 digits
|
Display
|
7-digit LED, overflow indicator
|
Input impedance
|
1 MΩ // 20 pF, ×5/×10/×50 attenuator (front) or 50 Ω // 20 pF (rear)
|
Time base stability
|
≤1×10-5; Opt. 1, ≤5×10-7 (0°C to +50°C after ½h warm-up)
|
Time base drift
|
≤1×10-5; Opt. 1, ≤1×10-7 (per month)
|
Options
- Option 1 – 5 MHz TCXO with 1:5 divider
- Option 2 – Automatic Gate Control and Readout Scaling Circuit (automatically selects the 0 .1-, 1-, or 10-second measurement interval to display the largest number of digits without overflow)
Rear Interface
Connector Pin
|
Signal
|
28B |
Second decimal point (D2) output
|
27A |
Internal scan clock disable input
|
27B |
MHz light output
|
26A |
Reset input/output
|
25A |
TS0 (Time Slot Zero) output
|
25B |
External scan clock input
|
24B |
Internal scan clock (2 kHz) output
|
23B |
Overflow output
|
22B |
MSD (most significant digit)
|
20B |
28 BCD output, serial by digit
|
20A |
24 BCD output, serial by digit
|
21B |
22 BCD output, serial by digit
|
19A |
21 BCD output, serial by digit
|
19B |
Data Good output
|
17A |
Signal input ground
|
16A |
Signal input
|
Gerbers
Pictures