MHINSTEK UDB1xxxS¶


Status	planned
Frequency (user)	0.01Hz-2MHz/5MHz/8MHz
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€.

Hardware¶

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)

Photos¶

Mhinstek Udb1305s Persp

Mhinstek Udb1305s Detail Analog

Mhinstek Udb1305s Detail Digital

Mhinstek Udb1305s Baseboard

Connection¶

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.

Protocol¶

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:

Identication
Set request
Get request

Most set requests have a corresponding get request.

Identification command¶

&#8594; a
&#8592; UDB1305S

Set/get requests¶

Select channel A/B¶

&#8594; bh1
&#8592; ok

&#8594; bh2
&#8592; ok

Query (ch) always reports channel 0 (i.e. neither 1 or 2)

Set/get frequency¶

5 MHz
&#8594; bf500000000
&#8592; ok

&#8594; cf
&#8592; cf500000000

2 kHz
&#8594; bf000200000
&#8592; ok

&#8594; cf
&#8592; cf000200000

1 Hz
&#8594; bf      100
&#8592; ok

&#8594; cf
&#8592; cf000000100

MHINSTEK UDB1xxxS¶