GRAS SysCheck2 User manual

Instruction Manual
SysCheck2™ Software Development Kit
LI0282 – 1 December 2021

December 2021
SysCheck2™ Software Development Kit
Instruction Manual
Copyright Notice
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Revision Date Description
1 26 Nov 2021 SDK version 2.0.7

Table of Contents
1 | Introduction - - - - - - - - - - - - - - - - - - - - 3
1.1 SDK for 246AE and 246AO microphones overview - - - - - - - 3
2 | SysCheck2 functional specifications - - - - - - - - - 5
3 | SysCheck2 behavior - - - - - - - - - - - - - - - - 7
3.1 SysCheck2 polarization voltage dependency - - - - - - - - - 7
3.2 SysCheck2 temperature dependency - - - - - - - - - - - - 8
4 | SysCheck2 usages - - - - - - - - - - - - - - - - - 9
4.1 Example of use case: - - - - - - - - - - - - - - - - - - - - 10
5 | 246AE and 246AO firmware 1.8 - - - - - - - - - - 13
5.1 Control via user data in template UIDID 127-0-0-0U - - - - - 13
5.1.1 Behavior - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13
5.1.2 Examples - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15
6 | Description of SysCheck2 microphone and integration
software 17
6.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - 17
6.2 Requirement specifications for user interface - - - - - - - - 17
6.3 SysCheck2 integration commands - - - - - - - - - - - - - 18
6.3.1 Function «Retrieve env parameter» - - - - - - - - - - - 19
6.3.2 Function «Make SysCheck2 reference» - - - - - - - - - 21
6.3.3 Function «SysCheck2» - - - - - - - - - - - - - - - - - - - - 23
6.4 Notes - - - - - - - - - - - - - - - - - - - - - - - - - - - 27
7 | GRAS TEDS editor SW0051 - - - - - - - - - - - - - 29

3
1 | Introduction
1.1 SDK for 246AE and 246AO micro-
phones overview
SysCheck2™is a GRAS-patented technology for verifying mea-
surement chain integrity. This verification tool performs remote
health check on microphones, channel gain and cable integrity.
The verifications are made on each SysCheck2-enabled micro-
phone connected to a CCP power module with transducer elec-
tronic data sheet (TEDS) support and measurement software
with one click.
This software development kit (SDK) enables access to the
SysCheck2 functionality.
You will need an analyzer with the ability to connect to a CCP-
based microphone and the ability to read and write to TEDS.
Alternatively, you can use a CCP-capable power analyzer with a
non-CCP-capable analyzer or sound card with TEDS read-write
capability. Because the required hardware is built into the micro-
phone itself (Fig 1), no further specialized hardware is needed.
Figure 1-1 | Schematic of SysCheck2 internal components.

4 | SysCheck2™ Software Development Kit Instruction Manual

5
2 | SysCheck2 functional specifications
The microphones’ acoustic specifications follow their GRAS 46Ax
counterparts.
SysCheck2-specific specifications are given in the following tables.
SysCheck2 generator specification (over temperature range -30°C
to 85°C):
Parameter Value Table 2-1
SysCheck2 generator
specification (over
temperature range
-30 to 85°C /
-22 to 185°F)
Frequency, sine 250 Hz
Frequency stability ±3%
Amplitude level
stability
±0.03 dB
Amplitude level
tolerance
±1 dB
Harmonic distortion -40 dB
Output level with no
microphone
-1.1 dB V
Output level with
246AE (Cmic: 14pF)
-27 dB V equivalent to
93 dBSPL
Output level with
246AO (Cmic: 20pF)
-27.5 dB V equivalent to
105.5 dBSPL
Parameter Value Table 2-2
Environment sensor:
(operational
-40 to 85°C /
-40 to 185°F)
Temperature ±2°C (0 to 65°C) /
±3.6°F (32 to 149°F)
Pressure, static ±1.5 hPa (0 to 65°C /
32 to 149°F), 300 hPa
to 1100 hPa)
Humidity, relative ±4% RH (0 to 60°C /
32 to 140°F, 0 to 100%)

6 | SysCheck2™ Software Development Kit Instruction Manual
Parameter Value Table 2-3
Temperature sensor
in CPU: (operational
-40°C to 125°C /
-40 to 257°F)
Temperature Typically ±3°C (-40 to 125°C) /
±5.4°F (-40 to 257°F)