|Waveforms||sine/square/triangle/sawtooth, TTL rect|
|Amplitude||10 V (open)/5 V (50 Ohm) (adjustable)|
|Connectivity||Serial TTL (3.3V)|
The UDB1302S/UDB1305S/UDB1308S is a Dual-Channel standalone function generator. It can be controlled with the push-buttons and the rotary encoder, or via a bidirectional serial interface.
Amplitude and offset voltage can only be controlled using potentiometers.
This device can be bought on ebay or aliexpress from various sellers for 40€/50€/60€.
- CPLD: Altera MAXII
- Clock: 34.56MHz
- STM8S105K4 8-bit MCU with 16 Kbytes Flash, 16 MHz CPU, integrated EEPROM STM8S10K54 procuct page
- 74AHC14 Hex inverting Schmitt trigger (TTL output buffer, Freq/counter input buffer)
All models communicate via an serial connection, at either 19200 or 57600 bps, 8 bits, no parity, and 1 stop bit (57600/8n1 or 19200/8n1). Connecting to the devices can be done with any USB-serial converter. Signalling level is 3.3V
UDB1505S uses 57600 bps.
The generator will respond to commands, which consist of a short ASCII string followed by CR (additional LFs are ignored). The meter will either send no response at all or some ASCII text followed by CR+LF.
There a three classes of commands:
- Set request
- Get request
Most set requests have a corresponding get request.
→ a ← UDB1305S
Select channel A/B
→ bh1 ← ok → bh2 ← ok
ch) always reports channel 0 (i.e. neither 1 or 2)
5 MHz → bf500000000 ← ok → cf ← cf500000000 2 kHz → bf000200000 ← ok → cf ← cf000200000 1 Hz → bf 100 ← ok → cf ← cf000000100