RS PRO S2¶


Status	in progress
Source code	appa-dmm
Counts	6000
IEC 61010-1	CAT III (1000V) / CAT IV (600V)
Connectivity	Bluetooth LE
Measurements	voltage, frequency, resistance, continuity, diode, capacitance, current, temperature
Features	autorange, data hold, min/max, relative, non-contact voltage detection hi/lo, backlight, true-rms, data logging, single value storage, auto-v/loz, VFD, built-in magnetic sticker, µA current range
Website	rsonline-privat.de

The RS PRO S2 is a 6000 counts, CAT IV (600V) / CAT III (1000V) handheld logging digital multimeter with Bluetooth LE connectivity and long battery duration. It is marketed as a "HVAC Multimeter" (optimized for the needs of heating, ventilation, and air conditioning technicians).

It is based on the APPA S2, See also: APPA Multimeters.

A sigrok-driver supporting these APPA-based devices ("appa-dmm" in sigrok) has been created and will be included in mainline sigrok once it passes acception (see developement repository github.com/Cymaphore/libsigrok branch appa-dmm).

Hardware¶

MCU: Atmel ATSAML22N18A-U
ADC-ID: Hycontek HY12P65
BLE-SoC: AMICCOM A8105
Fuses: Current range 400mA: Amp rating: 0.44A, Voltage rating: 1kV, Interrupting rating: 10kA, Opening: Fast acting, Size: 10mm x 34.9mm
Power supply: 2 x IEC LR6 1.5V (works fine with IEC HR6 1.2V)

Photos and Teardown¶

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Front view

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S2 connected to SmuView visualizing readings from the power grid

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Measuring voltage from the power grid

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Display close-up with backlight on

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Rear view

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Magnetic sticker close up

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        [](./img/RS_PRO_S2_-_Magnetic_sticker.jpg)

Magnetic sticker inside view

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Protective sleeve removed

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Rear

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        [](./img/RS_PRO_S2_-_Teardown_-_01.jpg)

Teardown 1/12

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Teardown 2/12

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Teardown 3/12

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Teardown 4/12

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Teardown 5/12

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Teardown 6/12

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Teardown 7/12

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Teardown 8/12

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Teardown 9/12

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Teardown 10/12

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Teardown 12/12

Tests¶

Unless noted otherweise, the tests in this section have been performed by Cymaphore on a RS PRO S2, Firmware v2015 / 808

Usage of rechargable NiMH batteries¶

The device works acceptable with rechargable batteries. Voltage boundaries are however a bit unsuitablefor NiMH cells, battery cut-off level of 1.14V/cell is to early, even for alkaline cells, this way the full capacity of the cells can not be used.

Battery indication

FULL: >2.86 V (~ 1.43 V/cell)
HALF: >2.68 V (~ 1.34 V/cell)
LOW: >2.46 V (~ >1.23 V/cell)
WARN: >2.28 V (~1.14 V/cell)
Forced POWER-OFF: <2.28 V (~ 1.14 V/cell)

Current consumption¶

Test supply voltage: 2.4 V

Details¶

All functions measured, average value over measurements taken.

Device active: 2.952 mA
With Bluetooth LE active in standby: 4.211 mA
With Bluetooth LE in active data acquisition: 7.538 mA
With display backlight on: 17.251 mA

If the device is in APO or low battery power off mode, it consumes 9µA.

Based on that numbers, with backlight off the device should be able to surpass the battery duration specified in the datasheet by a lot, making long duration logging sessions possible.