From TekWiki
Jump to navigation Jump to search
Tektronix DC505
225 MHz counter/timer
Tektronix DC505

Produced from 1974 to 1981

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix DC505 is a 225 MHz counter/timer plug-in for the TM500 system.

Key Specifications

Frequency range 0 Hz (DC coupled) / 10 Hz (AC coupled) to 225 MHz
Sensitivity 50 mVRMS to 150 MHz, 100 mVRMS to 225 MHz (sine)
Resolution 7 digits
Gate time 0.01 s to 10 s in decade steps
Stability Standard: 1×10−5; Opt.1: 5×10−7 (0°C to +50°C, after 30 min warm-up)
Long-term drift Standard: 1×10−5 per month; Opt.1: 5×10−7 per month
  • Two input channels (BNC connectors)
  • Functions: Frequency, frequency ratio, period, interval, pulse width, events

Rear Interface

Connector Pin Signal
27A Internal Scan Clock Disable
26B Manual Start-Stop
25B,24B Internal Scan Clock Out
25A Time Slot Zero
23B Overflow
21B BCD output 2
20B BCD output 8
20A BCD output 4
19A BCD output 1
19B Data Good
14A Ext Clock Input

Data is output serially by digit,