DC501

Manuals – Specifications – Links – Pictures

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)

Links

Documents referencing DC501

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

• Divide-by-5 circuit board gerbers 670-3300-00 (ZIP)

Pictures

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  Manual photo

Components

Some Parts Used in the DC501